The document discusses sign charts and inequalities. It explains how to determine if an expression is positive or negative when evaluated with different values of x. It provides examples of factoring expressions like x^2 - 2x - 3 to determine the signs. The key steps to create a sign chart are: 1) solve for f=0, 2) mark solutions on a number line, 3) sample points in each segment to determine the sign. A sign chart graphically shows the regions where an expression is positive, negative or zero.
The document discusses sign charts and inequalities. It provides examples of determining the sign (positive or negative) of expressions for given values of x. Specifically, it explains how to:
1. Factor polynomials or rational expressions to determine sign.
2. Construct a sign chart by solving for f=0, marking those values on a number line, and testing points in each segment.
3. Use a sign chart to indicate where an expression like f=x^2 - 3x - 4 is equal to 0, positive, or negative based on the value of x.
The document discusses the difference quotient formula for calculating the slope of a cord connecting two points (x, f(x)) and (x+h, f(x+h)) on a function graph. It defines the difference quotient as (f(x+h) - f(x))/h, which calculates the slope as the change in y-values (f(x+h) - f(x)) over the change in x-values (h). An example calculates the slope of the cord connecting the points (2, f(2)) and (2.2, f(2.2)) on the function f(x) = x^2 - 2x + 2.
The document discusses calculating the slope of a curve between two points (x, f(x)) and (x+h, f(x+h)) using the difference quotient formula. It defines the difference quotient as (f(x+h) - f(x))/h, where h is the difference between x and x+h. An example calculates the slope between the points (2, f(2)) and (2.2, f(2.2)) for the function f(x) = x^2 - 2x + 2, finding the slope to be 0.44.
The document discusses sign charts of factorable polynomials. A polynomial is factorable if it can be written as the product of linear factors. The sign chart of a factorable polynomial follows an important rule: if a root has an even order, the signs are the same on both sides; if a root has an odd order, the signs are different on both sides. This is called the even/odd-order sign rule. An example demonstrates finding the sign chart of a polynomial by identifying the roots and their orders, and then applying the sign rule.
The document describes the rectangular coordinate system. Each point in the plane can be located using an ordered pair (x, y) representing horizontal and vertical distances from the origin. The x-axis represents horizontal distance and the y-axis represents vertical distance. Changing the x-value moves a point right or left, and changing the y-value moves a point up or down. The four quadrants are defined by the positive and negative x and y axes. Reflecting a point across an axis results in another point with the same distances but opposite sign for the axis coordinate.
The document discusses various transformations that can be performed on graphs of functions, including vertical translations, stretches and compressions, and vertical reflections. Vertical translations move the graph up or down by adding or subtracting a constant value to the output. Stretches and compressions multiply the output by a constant value greater than or less than 1, respectively. Reflecting the output about the x-axis vertically reflects the entire graph. These transformations can be represented by modifying the original function definition.
The document describes the rectangular coordinate system. Each point in a plane can be located using an ordered pair (x,y) where x represents the distance right or left from the origin and y represents the distance up or down. Changing the x-value moves the point right or left, and changing the y-value moves the point up or down. The plane is divided into four quadrants based on the sign of the x and y values. Reflecting a point across an axis results in another point with the same magnitude but opposite sign for the corresponding coordinate.
3.3 graphs of factorable polynomials and rational functionsmath265
The document discusses graphs of factorable polynomials. It begins by showing examples of graphs of even and odd degree polynomials like y=x2, y=x4, y=x3, and y=-x5. It then explains that the graphs of polynomials are smooth, unbroken curves. For large values of x, the leading term of a polynomial dominates and determines the graph's behavior. Based on the leading term and whether the degree is even or odd, the graph exhibits one of four behaviors as x approaches infinity. The document demonstrates how to construct the sign chart of a polynomial from its roots and use it to sketch the central portion of the graph. It provides an example of sketching the graph of y=x
The document discusses sign charts and inequalities. It provides examples of determining the sign (positive or negative) of expressions for given values of x. Specifically, it explains how to:
1. Factor polynomials or rational expressions to determine sign.
2. Construct a sign chart by solving for f=0, marking those values on a number line, and testing points in each segment.
3. Use a sign chart to indicate where an expression like f=x^2 - 3x - 4 is equal to 0, positive, or negative based on the value of x.
The document discusses the difference quotient formula for calculating the slope of a cord connecting two points (x, f(x)) and (x+h, f(x+h)) on a function graph. It defines the difference quotient as (f(x+h) - f(x))/h, which calculates the slope as the change in y-values (f(x+h) - f(x)) over the change in x-values (h). An example calculates the slope of the cord connecting the points (2, f(2)) and (2.2, f(2.2)) on the function f(x) = x^2 - 2x + 2.
The document discusses calculating the slope of a curve between two points (x, f(x)) and (x+h, f(x+h)) using the difference quotient formula. It defines the difference quotient as (f(x+h) - f(x))/h, where h is the difference between x and x+h. An example calculates the slope between the points (2, f(2)) and (2.2, f(2.2)) for the function f(x) = x^2 - 2x + 2, finding the slope to be 0.44.
The document discusses sign charts of factorable polynomials. A polynomial is factorable if it can be written as the product of linear factors. The sign chart of a factorable polynomial follows an important rule: if a root has an even order, the signs are the same on both sides; if a root has an odd order, the signs are different on both sides. This is called the even/odd-order sign rule. An example demonstrates finding the sign chart of a polynomial by identifying the roots and their orders, and then applying the sign rule.
The document describes the rectangular coordinate system. Each point in the plane can be located using an ordered pair (x, y) representing horizontal and vertical distances from the origin. The x-axis represents horizontal distance and the y-axis represents vertical distance. Changing the x-value moves a point right or left, and changing the y-value moves a point up or down. The four quadrants are defined by the positive and negative x and y axes. Reflecting a point across an axis results in another point with the same distances but opposite sign for the axis coordinate.
The document discusses various transformations that can be performed on graphs of functions, including vertical translations, stretches and compressions, and vertical reflections. Vertical translations move the graph up or down by adding or subtracting a constant value to the output. Stretches and compressions multiply the output by a constant value greater than or less than 1, respectively. Reflecting the output about the x-axis vertically reflects the entire graph. These transformations can be represented by modifying the original function definition.
The document describes the rectangular coordinate system. Each point in a plane can be located using an ordered pair (x,y) where x represents the distance right or left from the origin and y represents the distance up or down. Changing the x-value moves the point right or left, and changing the y-value moves the point up or down. The plane is divided into four quadrants based on the sign of the x and y values. Reflecting a point across an axis results in another point with the same magnitude but opposite sign for the corresponding coordinate.
3.3 graphs of factorable polynomials and rational functionsmath265
The document discusses graphs of factorable polynomials. It begins by showing examples of graphs of even and odd degree polynomials like y=x2, y=x4, y=x3, and y=-x5. It then explains that the graphs of polynomials are smooth, unbroken curves. For large values of x, the leading term of a polynomial dominates and determines the graph's behavior. Based on the leading term and whether the degree is even or odd, the graph exhibits one of four behaviors as x approaches infinity. The document demonstrates how to construct the sign chart of a polynomial from its roots and use it to sketch the central portion of the graph. It provides an example of sketching the graph of y=x
The document discusses polynomial division algorithms. It introduces long division and synthetic division as methods for dividing polynomials. Long division is analogous to dividing numbers, while synthetic division is simpler but only applies when dividing a polynomial by a monomial. The key points are:
- Long division allows dividing any polynomial P(x) by any polynomial D(x) to obtain a quotient Q(x) and remainder R(x) such that P(x) = Q(x)D(x) + R(x) and the degree of R(x) is less than the degree of D(x).
- Synthetic division is more efficient than long division when dividing a polynomial by a monomial of the form (
The document discusses factorable polynomials and how to graph them. It defines a factorable polynomial as one that can be written as the product of linear factors using real numbers. For large values of x, the leading term of a polynomial dominates so the graph resembles that of the leading term. To graph a factorable polynomial, one first graphs the individual factors like x^n and then combines them, which gives smooth curves tending to the graphs of the leading terms for large x.
The document discusses quadratic functions and parabolas. It defines quadratic functions as functions of the form y = ax2 + bx + c, where a ≠ 0. Parabolas are the graphs of quadratic functions and have certain properties: they are symmetric about a center line, with the highest/lowest point (called the vertex) sitting on the center line. The vertex position can be found using the formula x = -b/2a. Examples are given of finding the vertex and graphing parabolas.
The document discusses the concept of slope and the difference quotient formula for calculating slope. It defines a function f(x) and points P(x,f(x)) and Q(x+h, f(x+h)) on the graph of f(x). The slope of the cord connecting points P and Q is given by the difference quotient (f(x+h) - f(x))/h. An example problem calculates this slope for the specific points P(2,2) and Q(2.2,2.44) on the parabola y=x^2 - 2x + 2.
The document discusses factorable polynomials and graphing them. It defines a factorable polynomial P(x) as one that can be written as the product of linear factors P(x) = an(x - r1)(x - r2)...(x - rk), where r1, r2, etc. are the roots of P(x). It explains that for large values of |x|, the leading term of P(x) dominates so the graph resembles that of the leading term, while near the roots other terms contribute to the shape of the graph. Examples of graphs of polynomials like x^n are provided to illustrate the approach.
The document discusses sign charts of factorable polynomials and rational expressions. It defines a factorable polynomial as one that can be written as the product of real linear factors. An example polynomial is fully factored. Roots of the polynomial are defined as the values making each linear factor equal to zero. The order of a root is defined as the power of the corresponding factor. The Even/Odd-Order Sign Rule is stated: for a factorable polynomial, signs are the same on both sides of an even-ordered root and different on both sides of an odd-ordered root. An example sign chart is constructed applying this rule.
1.2 review on algebra 2-sign charts and inequalitiesmath265
The document discusses sign charts and inequalities. It explains that sign charts can be used to determine if expressions are positive or negative by factoring them and evaluating at given values of x. Examples are provided to demonstrate how to construct a sign chart by: 1) solving for where the expression equals 0, 2) marking these values on a number line, and 3) evaluating the expression at sample points in each segment to determine the signs in between values where the expression equals 0. The sign chart then indicates the ranges where the expression is positive, negative or zero.
The document discusses rational expressions, which are expressions of the form P/Q where P and Q are polynomials. Polynomials are expressions involving powers of variables with numerical coefficients. Rational expressions include polynomials as a special case where P is viewed as P/1. They can be written in expanded or factored form. The factored form is useful for solving equations, determining the domain of valid inputs, evaluating expressions, and determining the sign of outputs. The domain excludes values that would make the denominator equal to 0. Solutions to equations involving rational expressions are the zeros of the numerator polynomial P.
- The order of a root of a polynomial is the number of times the root repeats.
- The polynomial x5 + 2x4 + x3 has two roots, x = 0 with order 3 and x = -1 with order 2.
- In general, polynomials of the form k(x - c1)m(x - c2)m...(x - cn)m have roots x = c1 with order m1, x = c2 with order m2, and so on.
This document discusses how to graph factorable polynomials by identifying the roots and their orders from the polynomial expression, making a sign chart, sketching the graph around each root based on the order, and connecting the pieces to obtain the full graph. As an example, it identifies the roots x=0, x=-2, and x=3 of order 1, 2, and 2 respectively from the polynomial P(x)=-x(x+2)2(x-3)2, makes the sign chart, and sketches the graph around each root to ultimately connect them into the full graph of P(x).
3.4 looking for real roots of real polynomialsmath260
The document discusses three theorems for finding real roots of real polynomials:
Descartes' Rule of Signs determines the possible number of positive or negative roots based on the variation in signs of coefficients. The Theorem of Bounds provides an interval where all real roots must reside. The Theorem of Rational Roots gives possible rational roots for polynomials with integer coefficients. Examples are provided to demonstrate applying the theorems.
The document discusses methods for graphing quadratic equations. It explains that the graphs of quadratic equations are called parabolas, which are symmetric around a center line with a highest or lowest point called the vertex. It provides an example of graphing the equation y = x^2 - 4x - 12 by first finding the vertex, then making a table of symmetric x and y values around the vertex and plotting the points. The document also describes how to find the x-intercepts and y-intercepts of a parabola and provides an alternate two-step method for graphing a parabola.
The document discusses sign charts and how to determine the signs of outputs for polynomials and rational expressions. It provides examples of factoring polynomials to determine if the output is positive or negative for given values of x. The key steps to create a sign chart are: 1) solve for f=0 and any undefined values, 2) mark these values on a number line, 3) sample points in each segment to determine the sign in that region. Sign charts indicate the regions where a function is positive, negative or zero.
The document discusses evaluating the formula log[(2x+1)/(sin1/3(x)+1)] at x=0 and x=10 degrees using a scientific calculator. It explains that the answer is 0 at x=0 and approximately 1.13 at x=10 degrees. It then describes the keyboard of a typical scientific calculator, noting the number, operation, yx, sin, log and formula keys. The rest of the document provides examples and definitions of algebraic, trigonometric and exponential-log formulas.
14 graphs of factorable rational functions xmath260
The document discusses graphs of rational functions. It defines rational functions as functions of the form R(x) = P(x)/Q(x) where P(x) and Q(x) are polynomials. It describes how vertical asymptotes occur where the denominator Q(x) is zero. The graph runs along either side of vertical asymptotes, going up or down depending on the sign chart. There are four cases for how the graph behaves at a vertical asymptote. The document uses examples to illustrate graphing rational functions and determining vertical asymptotes. It also mentions horizontal asymptotes will be discussed.
The document discusses various transformations that can be performed on graphs of functions, including vertical translations, stretches, and compressions. Vertical translations move the entire graph up or down by adding or subtracting a constant to the function. Stretches elongate or compress the graph vertically by multiplying the function by a constant greater than or less than 1, respectively. These transformations can be represented by modifying the original function in a way that corresponds to the geometric transformation of its graph.
This document discusses two applications of tangent lines: differentials and linear approximation, and finding the tangent line T(b) at a nearby point b. It explains that the tangent line T(x) at point (a, f(a)) is given by T(x) = f'(a)(x - a) + f(a). The slope f'(a) is identified with the derivative dy/dx. There are two ways to find T(b): directly using T(x), or by finding the differential ΔT = dy and using ΔT + f(a) = T(b).
t5 graphs of trig functions and inverse trig functionsmath260
The document discusses the benefits of exercise for mental health. Regular physical activity can help reduce anxiety and depression and improve mood and cognitive functioning. Exercise causes chemical changes in the brain that may help protect against mental illness and improve symptoms.
The document discusses mathematical expressions and polynomials. It provides examples of algebraic expressions involving variables and operations. Polynomial expressions are algebraic expressions that can be written in the form anxn + an-1xn-1 + ... + a1x + a0, where the ai coefficients are numbers. The document gives examples of factoring polynomials using formulas like a3b3 = (ab)(a2ab + b2). Factoring polynomials makes it easier to calculate outputs and simplify expressions for operations like addition and subtraction.
The document discusses using sign charts to solve polynomial and rational inequalities. It provides examples of solving inequalities by setting one side equal to zero, factoring the expression, drawing the sign chart, and determining the solutions from the regions with the appropriate signs. Specifically, it works through examples of solving x^2 - 3x > 4, 2x^2 - x^3/(x^2 - 2x + 1) < 0, and (x - 2)/(2/(x - 1)) < 3.
The document discusses sign charts for factorable formulas. It provides examples of determining the sign (positive or negative) of expressions when evaluated at given values of x by factoring the expressions into their factored forms. The key steps to create a sign chart are: 1) solve for values where the expression is equal to 0, 2) mark these values on a number line, 3) select points in each segment to test the sign, 4) indicate the sign (positive or negative) in each segment based on the testing. Sign charts show the regions where an expression is positive, negative or equal to 0.
42 sign charts of factorable expressions and inequalitiesmath126
The document discusses using the factor form of expressions to determine the sign (positive or negative) of outputs. It explains that for a factorable expression f, its factor form can be used to infer if the output is positive or negative. Polynomial and rational expressions are given as examples. The document then demonstrates this process on some examples, factoring expressions and evaluating their signs for given values. It introduces the concept of a sign chart, which uses the factor form to graphically depict the positive and negative regions of a function.
The document discusses polynomial division algorithms. It introduces long division and synthetic division as methods for dividing polynomials. Long division is analogous to dividing numbers, while synthetic division is simpler but only applies when dividing a polynomial by a monomial. The key points are:
- Long division allows dividing any polynomial P(x) by any polynomial D(x) to obtain a quotient Q(x) and remainder R(x) such that P(x) = Q(x)D(x) + R(x) and the degree of R(x) is less than the degree of D(x).
- Synthetic division is more efficient than long division when dividing a polynomial by a monomial of the form (
The document discusses factorable polynomials and how to graph them. It defines a factorable polynomial as one that can be written as the product of linear factors using real numbers. For large values of x, the leading term of a polynomial dominates so the graph resembles that of the leading term. To graph a factorable polynomial, one first graphs the individual factors like x^n and then combines them, which gives smooth curves tending to the graphs of the leading terms for large x.
The document discusses quadratic functions and parabolas. It defines quadratic functions as functions of the form y = ax2 + bx + c, where a ≠ 0. Parabolas are the graphs of quadratic functions and have certain properties: they are symmetric about a center line, with the highest/lowest point (called the vertex) sitting on the center line. The vertex position can be found using the formula x = -b/2a. Examples are given of finding the vertex and graphing parabolas.
The document discusses the concept of slope and the difference quotient formula for calculating slope. It defines a function f(x) and points P(x,f(x)) and Q(x+h, f(x+h)) on the graph of f(x). The slope of the cord connecting points P and Q is given by the difference quotient (f(x+h) - f(x))/h. An example problem calculates this slope for the specific points P(2,2) and Q(2.2,2.44) on the parabola y=x^2 - 2x + 2.
The document discusses factorable polynomials and graphing them. It defines a factorable polynomial P(x) as one that can be written as the product of linear factors P(x) = an(x - r1)(x - r2)...(x - rk), where r1, r2, etc. are the roots of P(x). It explains that for large values of |x|, the leading term of P(x) dominates so the graph resembles that of the leading term, while near the roots other terms contribute to the shape of the graph. Examples of graphs of polynomials like x^n are provided to illustrate the approach.
The document discusses sign charts of factorable polynomials and rational expressions. It defines a factorable polynomial as one that can be written as the product of real linear factors. An example polynomial is fully factored. Roots of the polynomial are defined as the values making each linear factor equal to zero. The order of a root is defined as the power of the corresponding factor. The Even/Odd-Order Sign Rule is stated: for a factorable polynomial, signs are the same on both sides of an even-ordered root and different on both sides of an odd-ordered root. An example sign chart is constructed applying this rule.
1.2 review on algebra 2-sign charts and inequalitiesmath265
The document discusses sign charts and inequalities. It explains that sign charts can be used to determine if expressions are positive or negative by factoring them and evaluating at given values of x. Examples are provided to demonstrate how to construct a sign chart by: 1) solving for where the expression equals 0, 2) marking these values on a number line, and 3) evaluating the expression at sample points in each segment to determine the signs in between values where the expression equals 0. The sign chart then indicates the ranges where the expression is positive, negative or zero.
The document discusses rational expressions, which are expressions of the form P/Q where P and Q are polynomials. Polynomials are expressions involving powers of variables with numerical coefficients. Rational expressions include polynomials as a special case where P is viewed as P/1. They can be written in expanded or factored form. The factored form is useful for solving equations, determining the domain of valid inputs, evaluating expressions, and determining the sign of outputs. The domain excludes values that would make the denominator equal to 0. Solutions to equations involving rational expressions are the zeros of the numerator polynomial P.
- The order of a root of a polynomial is the number of times the root repeats.
- The polynomial x5 + 2x4 + x3 has two roots, x = 0 with order 3 and x = -1 with order 2.
- In general, polynomials of the form k(x - c1)m(x - c2)m...(x - cn)m have roots x = c1 with order m1, x = c2 with order m2, and so on.
This document discusses how to graph factorable polynomials by identifying the roots and their orders from the polynomial expression, making a sign chart, sketching the graph around each root based on the order, and connecting the pieces to obtain the full graph. As an example, it identifies the roots x=0, x=-2, and x=3 of order 1, 2, and 2 respectively from the polynomial P(x)=-x(x+2)2(x-3)2, makes the sign chart, and sketches the graph around each root to ultimately connect them into the full graph of P(x).
3.4 looking for real roots of real polynomialsmath260
The document discusses three theorems for finding real roots of real polynomials:
Descartes' Rule of Signs determines the possible number of positive or negative roots based on the variation in signs of coefficients. The Theorem of Bounds provides an interval where all real roots must reside. The Theorem of Rational Roots gives possible rational roots for polynomials with integer coefficients. Examples are provided to demonstrate applying the theorems.
The document discusses methods for graphing quadratic equations. It explains that the graphs of quadratic equations are called parabolas, which are symmetric around a center line with a highest or lowest point called the vertex. It provides an example of graphing the equation y = x^2 - 4x - 12 by first finding the vertex, then making a table of symmetric x and y values around the vertex and plotting the points. The document also describes how to find the x-intercepts and y-intercepts of a parabola and provides an alternate two-step method for graphing a parabola.
The document discusses sign charts and how to determine the signs of outputs for polynomials and rational expressions. It provides examples of factoring polynomials to determine if the output is positive or negative for given values of x. The key steps to create a sign chart are: 1) solve for f=0 and any undefined values, 2) mark these values on a number line, 3) sample points in each segment to determine the sign in that region. Sign charts indicate the regions where a function is positive, negative or zero.
The document discusses evaluating the formula log[(2x+1)/(sin1/3(x)+1)] at x=0 and x=10 degrees using a scientific calculator. It explains that the answer is 0 at x=0 and approximately 1.13 at x=10 degrees. It then describes the keyboard of a typical scientific calculator, noting the number, operation, yx, sin, log and formula keys. The rest of the document provides examples and definitions of algebraic, trigonometric and exponential-log formulas.
14 graphs of factorable rational functions xmath260
The document discusses graphs of rational functions. It defines rational functions as functions of the form R(x) = P(x)/Q(x) where P(x) and Q(x) are polynomials. It describes how vertical asymptotes occur where the denominator Q(x) is zero. The graph runs along either side of vertical asymptotes, going up or down depending on the sign chart. There are four cases for how the graph behaves at a vertical asymptote. The document uses examples to illustrate graphing rational functions and determining vertical asymptotes. It also mentions horizontal asymptotes will be discussed.
The document discusses various transformations that can be performed on graphs of functions, including vertical translations, stretches, and compressions. Vertical translations move the entire graph up or down by adding or subtracting a constant to the function. Stretches elongate or compress the graph vertically by multiplying the function by a constant greater than or less than 1, respectively. These transformations can be represented by modifying the original function in a way that corresponds to the geometric transformation of its graph.
This document discusses two applications of tangent lines: differentials and linear approximation, and finding the tangent line T(b) at a nearby point b. It explains that the tangent line T(x) at point (a, f(a)) is given by T(x) = f'(a)(x - a) + f(a). The slope f'(a) is identified with the derivative dy/dx. There are two ways to find T(b): directly using T(x), or by finding the differential ΔT = dy and using ΔT + f(a) = T(b).
t5 graphs of trig functions and inverse trig functionsmath260
The document discusses the benefits of exercise for mental health. Regular physical activity can help reduce anxiety and depression and improve mood and cognitive functioning. Exercise causes chemical changes in the brain that may help protect against mental illness and improve symptoms.
The document discusses mathematical expressions and polynomials. It provides examples of algebraic expressions involving variables and operations. Polynomial expressions are algebraic expressions that can be written in the form anxn + an-1xn-1 + ... + a1x + a0, where the ai coefficients are numbers. The document gives examples of factoring polynomials using formulas like a3b3 = (ab)(a2ab + b2). Factoring polynomials makes it easier to calculate outputs and simplify expressions for operations like addition and subtraction.
The document discusses using sign charts to solve polynomial and rational inequalities. It provides examples of solving inequalities by setting one side equal to zero, factoring the expression, drawing the sign chart, and determining the solutions from the regions with the appropriate signs. Specifically, it works through examples of solving x^2 - 3x > 4, 2x^2 - x^3/(x^2 - 2x + 1) < 0, and (x - 2)/(2/(x - 1)) < 3.
The document discusses sign charts for factorable formulas. It provides examples of determining the sign (positive or negative) of expressions when evaluated at given values of x by factoring the expressions into their factored forms. The key steps to create a sign chart are: 1) solve for values where the expression is equal to 0, 2) mark these values on a number line, 3) select points in each segment to test the sign, 4) indicate the sign (positive or negative) in each segment based on the testing. Sign charts show the regions where an expression is positive, negative or equal to 0.
42 sign charts of factorable expressions and inequalitiesmath126
The document discusses using the factor form of expressions to determine the sign (positive or negative) of outputs. It explains that for a factorable expression f, its factor form can be used to infer if the output is positive or negative. Polynomial and rational expressions are given as examples. The document then demonstrates this process on some examples, factoring expressions and evaluating their signs for given values. It introduces the concept of a sign chart, which uses the factor form to graphically depict the positive and negative regions of a function.
The document discusses using sign charts to determine the sign (positive, negative, or zero) of polynomials and rational expressions for different values of x. It provides examples of drawing sign charts for various expressions and using them to solve inequality statements. Key steps include factoring expressions, identifying zeros and undefined values, and testing sample points in each interval to determine the sign over that interval. Sign charts can then be used to easily solve inequality statements by identifying the intervals where the expression is positive or negative.
The document discusses graphing quadratic functions. It defines a quadratic function as f(x) = ax^2 + bx + c where a, b, and c are real numbers and a is not equal to 0. The graph of a quadratic function is a parabola that is symmetrical about an axis. When the leading coefficient a is positive, the parabola opens upward and the vertex is a minimum. When a is negative, the parabola opens downward and the vertex is a maximum. Standard forms for quadratic functions and methods for finding characteristics like the vertex, axis of symmetry, and x-intercepts from the equation are also presented.
This document discusses probability distributions and binomial distributions. It defines:
i) Discrete and continuous probability distributions.
ii) The binomial distribution properties including the number of trials (n), probability of success (p), and probability of failure (q).
iii) How to calculate the mean, variance, and standard deviation of a binomial distribution using the formulas: mean=np, variance=npq, and standard deviation=√(npq).
The document discusses rational expressions, which are expressions of the form P/Q, where P and Q are polynomials. Polynomials are expressions involving powers of variables with numerical coefficients. Rational expressions include polynomials as a special case where P is viewed as P/1. They can be written in expanded or factored form. The factored form is useful for solving equations, determining the domain of a rational expression, evaluating inputs, and determining the sign of outputs. The domain excludes values that make the denominator equal to 0.
The document discusses rational expressions, which are expressions of the form P/Q where P and Q are polynomials. Polynomials are expressions involving powers of variables with numerical coefficients. Rational expressions include polynomials as a special case where P is viewed as P/1. They may be written in expanded or factored form. The factored form is useful for determining the domain of a rational expression, solving equations involving rational expressions, evaluating expressions for given inputs, and determining the signs of outputs. The domain excludes values of x that make the denominator equal to 0.
Rational expressions are expressions of the form P/Q, where P and Q are polynomials. Polynomials are expressions of the form anxn + an-1xn-1 + ... + a1x1 + a0. Rational expressions can be written in either expanded or factored form. The factored form is useful for determining the domain of a rational expression, solving equations involving rational expressions, evaluating inputs, and determining the sign of outputs. The domain of a rational expression excludes values of x that make the denominator equal to 0.
The document discusses the difference quotient formula for calculating the slope between two points (x1,y1) and (x2,y2) on a function y=f(x). It shows that the slope m is equal to (f(x+h)-f(x))/h, where h is the difference between x1 and x2. This "difference quotient" formula allows slopes to be calculated from the values of a function at two nearby points. Examples are given of simplifying the difference quotient for quadratic and rational functions.
The document provides an agenda for today that includes:
- New topics on Khan Academy
- Warm-up/final exam preparation
- Using coordinate formulas
- Class work from last week
- Current class work
It then lists practice questions related to graphing, slopes of lines, writing equations of lines, finding intercepts, and using different forms of linear equations. The document provides instruction and examples for students to work on these math skills.
This module covers quadratic functions and equations. Students will learn to determine the zeros of quadratic functions by relating them to the roots of quadratic equations. They will also learn to find the roots of quadratic equations using factoring, completing the square, and the quadratic formula. The module aims to help students derive quadratic functions given certain conditions like the zeros, a table of values, or a graph.
This module introduces quadratic functions. It discusses identifying quadratic functions as those with the highest exponent of 2, rewriting quadratic functions in general form f(x) = ax^2 + bx + c and standard form f(x) = a(x-h)^2 + k, and the key properties of quadratic graphs including the vertex and axis of symmetry. The module provides examples of identifying quadratic functions from equations and ordered pairs/tables and rewriting quadratic functions between general and standard form using completing the square.
This learner's module discusses or talks about the topic of Quadratic Functions. It also discusses what is Quadratic Functions. It also shows how to transform or rewrite the equation f(x)=ax2 + bx + c to f(x)= a(x-h)2 + k. It will also show the different characteristics of Quadratic Functions.
The document provides an overview of polynomials, including definitions, examples, and key concepts. Some key points covered include:
- A polynomial is an expression with multiple terms and powers that can be simplified.
- Polynomials have coefficients, degrees, roots, and can be written in nested form using brackets.
- Methods for evaluating, dividing, and factorizing polynomials are discussed, including synthetic division and finding factors.
- Graphs can be used to determine the equation of a polynomial function based on intercepts.
- Approximate roots can be found between values where the polynomial changes signs.
A quadratic function has the form f(x) = ax^2 + bx + c, where a != 0. The graph of a quadratic function is a parabola, which is symmetric around its axis of symmetry. Any quadratic function can be written in standard form by completing the square, where the standard form is f(x) = a(x-h)^2 + k. The vertex of the parabola is the point (h, k) and the line of symmetry is x = h.
A quadratic function is a function of the form f(x) = ax^2 + bx + c, where a is not equal to zero. The graph of a quadratic function is a parabola, which is symmetric around its axis of symmetry. Any quadratic function can be written in standard form by completing the square, where the standard form is f(x) = a(x-h)^2 + k. The vertex of the parabola is the point (h, k) and finding the standard form makes it easy to identify the vertex.
The document discusses point-slope form of linear equations. It provides examples of writing equations in point-slope form given a slope and point, as well as graphing lines from their point-slope form equations. Key aspects include using the difference in y-values as the slope times the difference in x-values, and substituting the point's x- and y-values and given slope into the point-slope form equation y - y1 = m(x - x1).
Linear approximations and_differentialsTarun Gehlot
The document discusses linear approximations and differentials. It explains that a linear approximation uses the tangent line at a point to approximate nearby values of a function. The linearization of a function f at a point a is the linear function L(x) = f(a) + f'(a)(x - a). Several examples are provided of finding the linearization of functions and using it to approximate values. Differentials are also introduced, where dy represents the change along the tangent line and ∆y represents the actual change in the function.
The document discusses Taylor expansions and Maclaurin polynomials. It explains that the Maclaurin polynomials are based on approximating a function around x=0 using its lower degree terms. The lower degree terms contribute most to the approximation near x=0. Examples are provided of finding the Taylor expansion of a polynomial function around different points by expressing it in terms of the variable (x-a). The process of constructing the Taylor and Maclaurin polynomials using derivatives is also outlined.
The document discusses Taylor expansions and Maclaurin polynomials. It explains that the Maclaurin polynomials are based on approximating a function around x=0 using its lower degree terms. The lower degree terms contribute most to the approximation near x=0. Examples are provided of finding the Taylor expansion of a polynomial function around different points by expressing it in terms of the variable (x-a). The process of constructing the Taylor and Maclaurin polynomials using derivatives is also outlined.
Similar to 7 sign charts and inequalities i x (20)
The document introduces matrices and matrix operations. Matrices are rectangular tables of numbers that are used for applications beyond solving systems of equations. Matrix notation defines a matrix with R rows and C columns as an R x C matrix. The entry in the ith row and jth column is denoted as aij. Matrices can be added or subtracted if they are the same size by adding or subtracting the corresponding entries. There are two types of matrix multiplication: scalar multiplication multiplies a matrix by a constant, and matrix multiplication involves multiplying corresponding rows and columns where the number of columns of the left matrix equals the rows of the right matrix.
35 Special Cases System of Linear Equations-x.pptxmath260
The document discusses special cases of systems of linear equations, including inconsistent/contradictory systems where the equations are impossible to satisfy simultaneously, and dependent systems where there are infinitely many solutions. An inconsistent system is shown with equations x + y = 2 and x + y = 3, which has no solution since they cannot both be true. A dependent system is shown with equations x + y = 2 and 2x + 2y = 4, which has infinitely many solutions like (2,0) and (1,1). The row-reduced echelon form (rref) of a matrix is also discussed, which puts a system of equations in a standard form to help determine if it is consistent, dependent, or has
The document discusses conic sections and ellipses. Conic sections are graphs of quadratic equations of the form Ax2 + By2 + Cx + Dy = E, where A and B are not both 0. Their graphs include circles, ellipses, parabolas and hyperbolas. Ellipses are defined as the set of all points where the sum of the distances to two fixed foci is a constant. Ellipses have a center, two axes called the semi-major and semi-minor axes, and radii along the x and y axes called the x-radius and y-radius. The standard form of an ellipse equation is presented.
This document discusses first degree functions and linear equations. It explains that most real-world mathematical functions can be composed of algebraic, trigonometric, or exponential/log formulas. Linear equations of the form Ax + By = C represent straight lines that can be graphed by finding the x- and y-intercepts. If an equation contains only one variable, it represents a vertical or horizontal line. The slope-intercept form y = mx + b is introduced, where m is the slope and b is the y-intercept. Slope is defined as the ratio of the rise over the run between two points on a line.
The document discusses notation and algebra of functions. It defines a function as a procedure that assigns a unique output to each valid input. Most mathematical functions are represented by formulas like f(x) = x^2 - 2x + 3, where f(x) is the name of the function, x is the input variable, and the formula defines the relationship between input and output. New functions can be formed using basic operations like addition, subtraction, multiplication, and division of existing functions. Examples are provided to demonstrate evaluating functions at given inputs and combining functions algebraically.
The document discusses exponents and exponent rules. It defines exponents as the number of times a base is multiplied by 1. It presents rules for multiplying, dividing, and raising exponents. Examples are provided to demonstrate applying the rules, such as using the power-multiply rule to evaluate (22*34)3. Special exponent rules are also covered, such as the 0-power rule where A0 equals 1 when A is not 0. The document provides examples of calculating fractional exponents by first extracting the root and then raising it to the numerator power.
The document discusses functions and their basic language. It defines a function as a procedure that assigns each input exactly one output. It provides examples of functions, such as a license number to name function. It explains that a function must have a domain (set of inputs) and range (set of outputs). Functions can be represented graphically, through tables of inputs and outputs, or with mathematical formulas.
19 more parabolas a& hyperbolas (optional) xmath260
After dividing the general quadratic equation Ax2 + By2 + Cx + Dy = E by A, three types of conic sections can be obtained:
1) Parabolas occur when B = 0, resulting in equations of the form 1x2 + #x + #y = #.
2) Circles occur when A = B, resulting in the equation 1x2 + 1y2 = 1.
3) Hyperbolas occur when A and B have opposite signs, resulting in equations of the form 1x2 + ry2 + #x + #y = # with r < 0. Hyperbolas have two foci and asymptotes, and points on the hyperbola have
The document discusses conic sections, specifically circles and ellipses. It defines an ellipse as the set of points where the sum of the distances to two fixed foci is a constant. An ellipse has a center, two axes (semi-major and semi-minor), and can be represented by the standard form (x-h)2/a2 + (y-k)2/b2 = 1, where (h,k) is the center, a is the x-radius, and b is the y-radius. Examples are provided to demonstrate finding attributes of ellipses from their equations.
This document discusses conic sections and first degree equations. It begins by introducing conic sections as the shapes formed by slicing a cone at different angles. It then covers first degree equations, noting that their graphs are straight lines that can be written in the form of y=mx+b. Specific examples of first degree equations and their graphs are shown. The document ends by introducing the four types of conic sections - circles, ellipses, parabolas, and hyperbolas - and how graphs of second degree equations can represent these shapes.
The document discusses quadratic functions and parabolas. It defines quadratic functions as functions of the form y = ax2 + bx + c, where a ≠ 0. It states that the graphs of quadratic equations are called parabolas. Parabolas are symmetric around a central line, with the vertex (highest/lowest point) located on this line. The vertex formula is given as x = -b/2a. Steps for graphing a parabola are outlined, including finding the vertex, another point, and reflections across the central line. An example graphs the parabola y = x2 - 4x - 12, finding the vertex as (2, -16) and x-intercepts as -
The document discusses first degree (linear) functions. It states that most real-world mathematical functions can be composed of formulas from three families: algebraic, trigonometric, and exponential-logarithmic. It focuses on linear functions of the form f(x)=mx+b, where m is the slope and b is the y-intercept. Examples are given of equations and how to determine the slope and y-intercept to write the equation in slope-intercept form as a linear function.
The document discusses the basic language of functions. It defines a function as a procedure that assigns each input exactly one output. Functions can be represented by formulas using typical variables like f(x) = x^2 - 2x + 3, where x is the input and f(x) is the output. Functions have a domain, which is the set of all possible inputs, and a range, which is the set of all possible outputs. Functions can be depicted graphically or via tables listing inputs and outputs.
The document discusses inverse functions. An inverse function reverses the input and output of a function. For a function f(x) to have an inverse function f^-1(y), it must be one-to-one, meaning that different inputs map to different outputs. The inverse of f(x) is obtained by solving the original function equation for x in terms of y. Examples show how to determine if a function has an inverse and how to calculate the inverse function. For non one-to-one functions like f(x)=x^2, the inverse procedure is not a well-defined function.
This document discusses two types of log and exponential equations: those that do not require calculators and numerical equations that do require calculators. Equations that do not require calculators can be solved by putting both sides into a common base, consolidating exponents, and dropping the base to solve the resulting equation. For log equations, logs are consolidated on each side first before dropping the log. Two examples demonstrating these solution methods are provided.
This document discusses solving numerical equations involving logarithmic and exponential functions. It provides examples of solving both log equations and exponential equations. To solve log equations, the problems are rewritten in exponential form by removing the log. To solve exponential equations, the exponents are brought down by rewriting the problem in logarithmic form. Steps include isolating the exponential or logarithmic term containing the unknown, rewriting the equation accordingly, and then solving for the unknown variable. Practice problems with solutions are provided to illustrate the process.
The document discusses exponential and logarithmic expressions. Exponential expressions like 43, 82, 26 all equal 64. Their corresponding logarithmic forms are log4(64), log8(64), log2(64) and equal 3, 2, 6 respectively. When working with exponential or logarithmic expressions, the base number must be identified first. Both numbers in the logarithmic expression logb(y) must be positive.
The document discusses periodic compound interest and continuous compound interest formulas. It provides an example to calculate the accumulation in an account over 20 years with an annual 8% interest rate compounded 100, 1000, and 10000 times per year. Compounding more frequently results in a larger return, approaching the continuous compound interest formula value. Compounding 10000 times per year yields the highest return of $4953.
24 exponential functions and periodic compound interests pina xmath260
The document discusses exponential functions and their properties. It defines exponential functions as functions of the form f(x) = bx where b > 0 and b ≠ 1. It provides examples of calculating exponential expressions using rules for positive integer, fractional, and real number exponents. Exponential functions are important in fields like finance, science, and computing. Common exponential functions include y = 10x, y = ex, and y = 2x. An example shows how to calculate compound interest monthly over several periods using the exponential function formulation.
23 looking for real roots of real polynomials xmath260
The document discusses three theorems for finding real roots of real polynomials:
1) Descartes' Rule of Signs determines the possible number of positive or negative real roots based on the variation in signs of the polynomial's coefficients.
2) The Theorem on the Bounds gives the interval where real roots must reside.
3) The Theorem on Rational Roots identifies possible rational roots for polynomials with integer coefficients.
Andreas Schleicher presents PISA 2022 Volume III - Creative Thinking - 18 Jun...EduSkills OECD
Andreas Schleicher, Director of Education and Skills at the OECD presents at the launch of PISA 2022 Volume III - Creative Minds, Creative Schools on 18 June 2024.
Walmart Business+ and Spark Good for Nonprofits.pdfTechSoup
"Learn about all the ways Walmart supports nonprofit organizations.
You will hear from Liz Willett, the Head of Nonprofits, and hear about what Walmart is doing to help nonprofits, including Walmart Business and Spark Good. Walmart Business+ is a new offer for nonprofits that offers discounts and also streamlines nonprofits order and expense tracking, saving time and money.
The webinar may also give some examples on how nonprofits can best leverage Walmart Business+.
The event will cover the following::
Walmart Business + (https://business.walmart.com/plus) is a new shopping experience for nonprofits, schools, and local business customers that connects an exclusive online shopping experience to stores. Benefits include free delivery and shipping, a 'Spend Analytics” feature, special discounts, deals and tax-exempt shopping.
Special TechSoup offer for a free 180 days membership, and up to $150 in discounts on eligible orders.
Spark Good (walmart.com/sparkgood) is a charitable platform that enables nonprofits to receive donations directly from customers and associates.
Answers about how you can do more with Walmart!"
Leveraging Generative AI to Drive Nonprofit InnovationTechSoup
In this webinar, participants learned how to utilize Generative AI to streamline operations and elevate member engagement. Amazon Web Service experts provided a customer specific use cases and dived into low/no-code tools that are quick and easy to deploy through Amazon Web Service (AWS.)
Chapter wise All Notes of First year Basic Civil Engineering.pptxDenish Jangid
Chapter wise All Notes of First year Basic Civil Engineering
Syllabus
Chapter-1
Introduction to objective, scope and outcome the subject
Chapter 2
Introduction: Scope and Specialization of Civil Engineering, Role of civil Engineer in Society, Impact of infrastructural development on economy of country.
Chapter 3
Surveying: Object Principles & Types of Surveying; Site Plans, Plans & Maps; Scales & Unit of different Measurements.
Linear Measurements: Instruments used. Linear Measurement by Tape, Ranging out Survey Lines and overcoming Obstructions; Measurements on sloping ground; Tape corrections, conventional symbols. Angular Measurements: Instruments used; Introduction to Compass Surveying, Bearings and Longitude & Latitude of a Line, Introduction to total station.
Levelling: Instrument used Object of levelling, Methods of levelling in brief, and Contour maps.
Chapter 4
Buildings: Selection of site for Buildings, Layout of Building Plan, Types of buildings, Plinth area, carpet area, floor space index, Introduction to building byelaws, concept of sun light & ventilation. Components of Buildings & their functions, Basic concept of R.C.C., Introduction to types of foundation
Chapter 5
Transportation: Introduction to Transportation Engineering; Traffic and Road Safety: Types and Characteristics of Various Modes of Transportation; Various Road Traffic Signs, Causes of Accidents and Road Safety Measures.
Chapter 6
Environmental Engineering: Environmental Pollution, Environmental Acts and Regulations, Functional Concepts of Ecology, Basics of Species, Biodiversity, Ecosystem, Hydrological Cycle; Chemical Cycles: Carbon, Nitrogen & Phosphorus; Energy Flow in Ecosystems.
Water Pollution: Water Quality standards, Introduction to Treatment & Disposal of Waste Water. Reuse and Saving of Water, Rain Water Harvesting. Solid Waste Management: Classification of Solid Waste, Collection, Transportation and Disposal of Solid. Recycling of Solid Waste: Energy Recovery, Sanitary Landfill, On-Site Sanitation. Air & Noise Pollution: Primary and Secondary air pollutants, Harmful effects of Air Pollution, Control of Air Pollution. . Noise Pollution Harmful Effects of noise pollution, control of noise pollution, Global warming & Climate Change, Ozone depletion, Greenhouse effect
Text Books:
1. Palancharmy, Basic Civil Engineering, McGraw Hill publishers.
2. Satheesh Gopi, Basic Civil Engineering, Pearson Publishers.
3. Ketki Rangwala Dalal, Essentials of Civil Engineering, Charotar Publishing House.
4. BCP, Surveying volume 1
Temple of Asclepius in Thrace. Excavation resultsKrassimira Luka
The temple and the sanctuary around were dedicated to Asklepios Zmidrenus. This name has been known since 1875 when an inscription dedicated to him was discovered in Rome. The inscription is dated in 227 AD and was left by soldiers originating from the city of Philippopolis (modern Plovdiv).
A Visual Guide to 1 Samuel | A Tale of Two HeartsSteve Thomason
These slides walk through the story of 1 Samuel. Samuel is the last judge of Israel. The people reject God and want a king. Saul is anointed as the first king, but he is not a good king. David, the shepherd boy is anointed and Saul is envious of him. David shows honor while Saul continues to self destruct.
Philippine Edukasyong Pantahanan at Pangkabuhayan (EPP) CurriculumMJDuyan
(𝐓𝐋𝐄 𝟏𝟎𝟎) (𝐋𝐞𝐬𝐬𝐨𝐧 𝟏)-𝐏𝐫𝐞𝐥𝐢𝐦𝐬
𝐃𝐢𝐬𝐜𝐮𝐬𝐬 𝐭𝐡𝐞 𝐄𝐏𝐏 𝐂𝐮𝐫𝐫𝐢𝐜𝐮𝐥𝐮𝐦 𝐢𝐧 𝐭𝐡𝐞 𝐏𝐡𝐢𝐥𝐢𝐩𝐩𝐢𝐧𝐞𝐬:
- Understand the goals and objectives of the Edukasyong Pantahanan at Pangkabuhayan (EPP) curriculum, recognizing its importance in fostering practical life skills and values among students. Students will also be able to identify the key components and subjects covered, such as agriculture, home economics, industrial arts, and information and communication technology.
𝐄𝐱𝐩𝐥𝐚𝐢𝐧 𝐭𝐡𝐞 𝐍𝐚𝐭𝐮𝐫𝐞 𝐚𝐧𝐝 𝐒𝐜𝐨𝐩𝐞 𝐨𝐟 𝐚𝐧 𝐄𝐧𝐭𝐫𝐞𝐩𝐫𝐞𝐧𝐞𝐮𝐫:
-Define entrepreneurship, distinguishing it from general business activities by emphasizing its focus on innovation, risk-taking, and value creation. Students will describe the characteristics and traits of successful entrepreneurs, including their roles and responsibilities, and discuss the broader economic and social impacts of entrepreneurial activities on both local and global scales.
ISO/IEC 27001, ISO/IEC 42001, and GDPR: Best Practices for Implementation and...PECB
Denis is a dynamic and results-driven Chief Information Officer (CIO) with a distinguished career spanning information systems analysis and technical project management. With a proven track record of spearheading the design and delivery of cutting-edge Information Management solutions, he has consistently elevated business operations, streamlined reporting functions, and maximized process efficiency.
Certified as an ISO/IEC 27001: Information Security Management Systems (ISMS) Lead Implementer, Data Protection Officer, and Cyber Risks Analyst, Denis brings a heightened focus on data security, privacy, and cyber resilience to every endeavor.
His expertise extends across a diverse spectrum of reporting, database, and web development applications, underpinned by an exceptional grasp of data storage and virtualization technologies. His proficiency in application testing, database administration, and data cleansing ensures seamless execution of complex projects.
What sets Denis apart is his comprehensive understanding of Business and Systems Analysis technologies, honed through involvement in all phases of the Software Development Lifecycle (SDLC). From meticulous requirements gathering to precise analysis, innovative design, rigorous development, thorough testing, and successful implementation, he has consistently delivered exceptional results.
Throughout his career, he has taken on multifaceted roles, from leading technical project management teams to owning solutions that drive operational excellence. His conscientious and proactive approach is unwavering, whether he is working independently or collaboratively within a team. His ability to connect with colleagues on a personal level underscores his commitment to fostering a harmonious and productive workplace environment.
Date: May 29, 2024
Tags: Information Security, ISO/IEC 27001, ISO/IEC 42001, Artificial Intelligence, GDPR
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2. Sign–Charts and Inequalities I
Given an expression f, it’s important to identify when
the output is positive (f > 0) and when the output is
negative (f < 0) when f is evaluated with a value x.
3. Example A. Determine whether the outcome is + or –
for x2 – 2x – 3 if x = –3/2, –1/2.
Sign–Charts and Inequalities I
Given an expression f, it’s important to identify when
the output is positive (f > 0) and when the output is
negative (f < 0) when f is evaluated with a value x.
4. Sign–Charts and Inequalities I
For polynomials or rational expressions,
factor them to determine the signs of their outputs.
Given an expression f, it’s important to identify when
the output is positive (f > 0) and when the output is
negative (f < 0) when f is evaluated with a value x.
Example A. Determine whether the outcome is + or –
for x2 – 2x – 3 if x = –3/2, –1/2.
5. In factored form x2 – 2x – 3 = (x – 3)(x + 1)
Sign–Charts and Inequalities I
For polynomials or rational expressions,
factor them to determine the signs of their outputs.
Given an expression f, it’s important to identify when
the output is positive (f > 0) and when the output is
negative (f < 0) when f is evaluated with a value x.
Example A. Determine whether the outcome is + or –
for x2 – 2x – 3 if x = –3/2, –1/2.
6. In factored form x2 – 2x – 3 = (x – 3)(x + 1)
Hence, for x = –3/2:
(–3/2 – 3)(–3/2 + 1)
Sign–Charts and Inequalities I
For polynomials or rational expressions,
factor them to determine the signs of their outputs.
Given an expression f, it’s important to identify when
the output is positive (f > 0) and when the output is
negative (f < 0) when f is evaluated with a value x.
Example A. Determine whether the outcome is + or –
for x2 – 2x – 3 if x = –3/2, –1/2.
7. In factored form x2 – 2x – 3 = (x – 3)(x + 1)
Hence, for x = –3/2:
(–3/2 – 3)(–3/2 + 1) is (–)(–) = + .
Sign–Charts and Inequalities I
For polynomials or rational expressions,
factor them to determine the signs of their outputs.
Given an expression f, it’s important to identify when
the output is positive (f > 0) and when the output is
negative (f < 0) when f is evaluated with a value x.
Example A. Determine whether the outcome is + or –
for x2 – 2x – 3 if x = –3/2, –1/2.
8. In factored form x2 – 2x – 3 = (x – 3)(x + 1)
Hence, for x = –3/2:
(–3/2 – 3)(–3/2 + 1) is (–)(–) = + .
And for x = –1/2:
(–1/2 – 3)(–1/2 + 1)
Sign–Charts and Inequalities I
For polynomials or rational expressions,
factor them to determine the signs of their outputs.
Given an expression f, it’s important to identify when
the output is positive (f > 0) and when the output is
negative (f < 0) when f is evaluated with a value x.
Example A. Determine whether the outcome is + or –
for x2 – 2x – 3 if x = –3/2, –1/2.
9. In factored form x2 – 2x – 3 = (x – 3)(x + 1)
Hence, for x = –3/2:
(–3/2 – 3)(–3/2 + 1) is (–)(–) = + .
And for x = –1/2:
(–1/2 – 3)(–1/2 + 1) is (–)(+) = – .
Sign–Charts and Inequalities I
For polynomials or rational expressions,
factor them to determine the signs of their outputs.
Given an expression f, it’s important to identify when
the output is positive (f > 0) and when the output is
negative (f < 0) when f is evaluated with a value x.
Example A. Determine whether the outcome is + or –
for x2 – 2x – 3 if x = –3/2, –1/2.
10. Example B. Determine whether the outcome is
x2 – 2x – 3
x2 + x – 2
x2 – 2x – 3
x2 + x – 2
In factored form =
(x – 3)(x + 1)
(x – 1)(x + 2)
Sign–Charts and Inequalities I
if x = –3/2, –1/2.
+ or – for
11. x2 – 2x – 3
x2 + x – 2
In factored form =
(x – 3)(x + 1)
(x – 1)(x + 2)
Hence, for x = –3/2:
(x – 3)(x + 1)
(x – 1)(x + 2)
=
(–)(–)
(–)(+)
Sign–Charts and Inequalities I
Example B. Determine whether the outcome is
x2 – 2x – 3
x2 + x – 2
if x = –3/2, –1/2.
+ or – for
12. x2 – 2x – 3
x2 + x – 2
In factored form =
(x – 3)(x + 1)
(x – 1)(x + 2)
Hence, for x = –3/2:
(x – 3)(x + 1)
(x – 1)(x + 2)
=
(–)(–)
(–)(+)
< 0
Sign–Charts and Inequalities I
Example B. Determine whether the outcome is
x2 – 2x – 3
x2 + x – 2
if x = –3/2, –1/2.
+ or – for
13. x2 – 2x – 3
x2 + x – 2
In factored form =
(x – 3)(x + 1)
(x – 1)(x + 2)
Hence, for x = –3/2:
(x – 3)(x + 1)
(x – 1)(x + 2)
=
(–)(–)
(–)(+)
< 0
For x = –1/2:
(x – 3)(x + 1)
(x – 1)(x + 2)
=
(–)(+)
(–)(+)
Sign–Charts and Inequalities I
Example B. Determine whether the outcome is
x2 – 2x – 3
x2 + x – 2
if x = –3/2, –1/2.
+ or – for
14. x2 – 2x – 3
x2 + x – 2
In factored form =
(x – 3)(x + 1)
(x – 1)(x + 2)
Hence, for x = –3/2:
(x – 3)(x + 1)
(x – 1)(x + 2)
=
(–)(–)
(–)(+)
< 0
For x = –1/2:
(x – 3)(x + 1)
(x – 1)(x + 2)
=
(–)(+)
(–)(+)
> 0
Sign–Charts and Inequalities I
Example B. Determine whether the outcome is
x2 – 2x – 3
x2 + x – 2
if x = –3/2, –1/2.
+ or – for
15. x2 – 2x – 3
x2 + x – 2
In factored form =
(x – 3)(x + 1)
(x – 1)(x + 2)
Hence, for x = –3/2:
(x – 3)(x + 1)
(x – 1)(x + 2)
=
(–)(–)
(–)(+)
< 0
For x = –1/2:
(x – 3)(x + 1)
(x – 1)(x + 2)
=
(–)(+)
(–)(+)
> 0
This leads to the sign charts of formulas. The sign–
chart of a formula gives the signs of the outputs.
Sign–Charts and Inequalities I
Example B. Determine whether the outcome is
x2 – 2x – 3
x2 + x – 2
if x = –3/2, –1/2.
+ or – for
16. Here is an example, the sign chart of f = x – 1:
Sign–Charts and Inequalities I
17. Here is an example, the sign chart of f = x – 1:
1
f = 0 + +
– – – – x – 1
Sign–Charts and Inequalities I
18. Here is an example, the sign chart of f = x – 1:
1
f = 0 + +
– – – – x – 1
The "+" indicates the region where the output is
positive i.e. if 1 < x.
Sign–Charts and Inequalities I
19. Here is an example, the sign chart of f = x – 1:
1
f = 0 + +
– – – – x – 1
The "+" indicates the region where the output is
positive i.e. if 1 < x. Likewise, the "–" indicates the
region where the output is negative, i.e. x < 1.
Sign–Charts and Inequalities I
20. Construction of the sign–chart of f.
Here is an example, the sign chart of f = x – 1:
1
f = 0 + +
– – – – x – 1
The "+" indicates the region where the output is
positive i.e. if 1 < x. Likewise, the "–" indicates the
region where the output is negative, i.e. x < 1.
Sign–Charts and Inequalities I
21. Construction of the sign–chart of f.
I. Solve for f = 0 (and denominator = 0) if there is any
denominator.
Here is an example, the sign chart of f = x – 1:
1
f = 0 + +
– – – – x – 1
The "+" indicates the region where the output is
positive i.e. if 1 < x. Likewise, the "–" indicates the
region where the output is negative, i.e. x < 1.
Sign–Charts and Inequalities I
22. Construction of the sign–chart of f.
I. Solve for f = 0 (and denominator = 0) if there is any
denominator.
II. Draw the real line, mark off the answers from I.
Here is an example, the sign chart of f = x – 1:
1
f = 0 + +
– – – – x – 1
The "+" indicates the region where the output is
positive i.e. if 1 < x. Likewise, the "–" indicates the
region where the output is negative, i.e. x < 1.
Sign–Charts and Inequalities I
23. Construction of the sign–chart of f.
I. Solve for f = 0 (and denominator = 0) if there is any
denominator.
II. Draw the real line, mark off the answers from I.
III. Sample each segment for signs by testing a point
in each segment.
Here is an example, the sign chart of f = x – 1:
1
f = 0 + +
– – – – x – 1
The "+" indicates the region where the output is
positive i.e. if 1 < x. Likewise, the "–" indicates the
region where the output is negative, i.e. x < 1.
Sign–Charts and Inequalities I
24. Construction of the sign–chart of f.
I. Solve for f = 0 (and denominator = 0) if there is any
denominator.
II. Draw the real line, mark off the answers from I.
III. Sample each segment for signs by testing a point
in each segment.
Here is an example, the sign chart of f = x – 1:
1
f = 0 + +
– – – – x – 1
The "+" indicates the region where the output is
positive i.e. if 1 < x. Likewise, the "–" indicates the
region where the output is negative, i.e. x < 1.
Fact: The sign stays the same for x's in between the
values from step I (where f = 0 or f is undefined.)
Sign–Charts and Inequalities I
25. Example C. Let f = x2 – 3x – 4 , use the sign–
chart to indicate when is f = 0, f > 0, and f < 0.
Sign–Charts and Inequalities I
26. Example C. Let f = x2 – 3x – 4 , use the sign–
chart to indicate when is f = 0, f > 0, and f < 0.
Solve x2 – 3x – 4 = 0
(x – 4)(x + 1) = 0 x = 4 , –1
Sign–Charts and Inequalities I
27. Example C. Let f = x2 – 3x – 4 , use the sign–
chart to indicate when is f = 0, f > 0, and f < 0.
Solve x2 – 3x – 4 = 0
(x – 4)(x + 1) = 0 x = 4 , –1
Mark off these points on a line:
(x–4)(x+1)
4
–1
Sign–Charts and Inequalities I
28. Example C. Let f = x2 – 3x – 4 , use the sign–
chart to indicate when is f = 0, f > 0, and f < 0.
Solve x2 – 3x – 4 = 0
(x – 4)(x + 1) = 0 x = 4 , –1
Mark off these points on a line:
(x–4)(x+1)
Select points to sample in each segment:
4
–1
Sign–Charts and Inequalities I
29. Example C. Let f = x2 – 3x – 4 , use the sign–
chart to indicate when is f = 0, f > 0, and f < 0.
Solve x2 – 3x – 4 = 0
(x – 4)(x + 1) = 0 x = 4 , –1
Mark off these points on a line:
(x–4)(x+1)
4
–1
Select points to sample in each segment:
Test x = – 2,
–2
Sign–Charts and Inequalities I
30. Example C. Let f = x2 – 3x – 4 , use the sign–
chart to indicate when is f = 0, f > 0, and f < 0.
Solve x2 – 3x – 4 = 0
(x – 4)(x + 1) = 0 x = 4 , –1
Mark off these points on a line:
(x–4)(x+1)
4
–1
Select points to sample in each segment:
Test x = – 2,
get – * – = + .
Hence the segment
is positive. Draw +
sign over it.
–2
Sign–Charts and Inequalities I
31. Example C. Let f = x2 – 3x – 4 , use the sign–
chart to indicate when is f = 0, f > 0, and f < 0.
Solve x2 – 3x – 4 = 0
(x – 4)(x + 1) = 0 x = 4 , –1
Mark off these points on a line:
(x–4)(x+1) + + + + +
4
–1
Select points to sample in each segment:
Test x = – 2,
get – * – = + .
Hence the segment
is positive. Draw +
sign over it.
–2
Sign–Charts and Inequalities I
32. Example C. Let f = x2 – 3x – 4 , use the sign–
chart to indicate when is f = 0, f > 0, and f < 0.
Solve x2 – 3x – 4 = 0
(x – 4)(x + 1) = 0 x = 4 , –1
Mark off these points on a line:
(x–4)(x+1) + + + + +
0 4
–1
Select points to sample in each segment:
Test x = – 2,
get – * – = + .
Hence the segment
is positive. Draw +
sign over it.
–2
Test x = 0,
get – * + = –.
Hence this segment
is negative.
Put – over it.
Sign–Charts and Inequalities I
33. Example C. Let f = x2 – 3x – 4 , use the sign–
chart to indicate when is f = 0, f > 0, and f < 0.
Solve x2 – 3x – 4 = 0
(x – 4)(x + 1) = 0 x = 4 , –1
Mark off these points on a line:
(x–4)(x+1) + + + + + – – – – –
0 4
–1
Select points to sample in each segment:
Test x = – 2,
get – * – = + .
Hence the segment
is positive. Draw +
sign over it.
–2
Test x = 0,
get – * + = –.
Hence this segment
is negative.
Put – over it.
Sign–Charts and Inequalities I
34. Example C. Let f = x2 – 3x – 4 , use the sign–
chart to indicate when is f = 0, f > 0, and f < 0.
Solve x2 – 3x – 4 = 0
(x – 4)(x + 1) = 0 x = 4 , –1
Mark off these points on a line:
(x–4)(x+1) + + + + + – – – – –
0 4
–1
Select points to sample in each segment:
Test x = – 2,
get – * – = + .
Hence the segment
is positive. Draw +
sign over it.
–2
Test x = 0,
get – * + = –.
Hence this segment
is negative.
Put – over it.
Test x = 5,
get + * + = +.
Hence this segment
is positive.
Put + over it.
5
Sign–Charts and Inequalities I
35. Example C. Let f = x2 – 3x – 4 , use the sign–
chart to indicate when is f = 0, f > 0, and f < 0.
Solve x2 – 3x – 4 = 0
(x – 4)(x + 1) = 0 x = 4 , –1
Mark off these points on a line:
(x–4)(x+1) + + + + + – – – – – + + + + +
0 4
–1
Select points to sample in each segment:
Test x = – 2,
get – * – = + .
Hence the segment
is positive. Draw +
sign over it.
–2
Test x = 0,
get – * + = –.
Hence this segment
is negative.
Put – over it.
Test x = 5,
get + * + = +.
Hence this segment
is positive.
Put + over it.
5
Sign–Charts and Inequalities I
36. Example D. Make the sign chart of f =
(x – 3)
(x – 1)(x + 2)
Sign–Charts and Inequalities I
37. Example D. Make the sign chart of f =
(x – 3)
(x – 1)(x + 2)
The root for f = 0 is from the zero of the numerator
which is x = 3.
Sign–Charts and Inequalities I
38. Example D. Make the sign chart of f =
(x – 3)
(x – 1)(x + 2)
The root for f = 0 is from the zero of the numerator
which is x = 3. The zeroes of the denominator
x = 1, –2 are the values where f is undefined (UDF).
Sign–Charts and Inequalities I
39. Example D. Make the sign chart of f =
(x – 3)
(x – 1)(x + 2)
The root for f = 0 is from the zero of the numerator
which is x = 3. The zeroes of the denominator
x = 1, –2 are the values where f is undefined (UDF).
Mark these values on a real line.
Sign–Charts and Inequalities I
40. Example D. Make the sign chart of f =
(x – 3)
(x – 1)(x + 2)
The root for f = 0 is from the zero of the numerator
which is x = 3. The zeroes of the denominator
x = 1, –2 are the values where f is undefined (UDF).
Mark these values on a real line.
(x – 3)
(x – 1)(x + 2) –2 1 3
UDF UDF f=0
Sign–Charts and Inequalities I
41. Example D. Make the sign chart of f =
Select a point to sample in each segment:
(x – 3)
(x – 1)(x + 2)
The root for f = 0 is from the zero of the numerator
which is x = 3. The zeroes of the denominator
x = 1, –2 are the values where f is undefined (UDF).
Mark these values on a real line.
(x – 3)
(x – 1)(x + 2) –2 1 3
UDF UDF f=0
–3 0 2 4
Sign–Charts and Inequalities I
42. Example D. Make the sign chart of f =
Select a point to sample in each segment:
Test x = –3,
we've a
(x – 3)
(x – 1)(x + 2)
The root for f = 0 is from the zero of the numerator
which is x = 3. The zeroes of the denominator
x = 1, –2 are the values where f is undefined (UDF).
Mark these values on a real line.
(x – 3)
(x – 1)(x + 2) –2 1 3
UDF UDF f=0
–3
( – )
( – )( – )
= –
segment.
0 2 4
Sign–Charts and Inequalities I
43. Example D. Make the sign chart of f =
Select a point to sample in each segment:
Test x = –3,
we've a
(x – 3)
(x – 1)(x + 2)
The root for f = 0 is from the zero of the numerator
which is x = 3. The zeroes of the denominator
x = 1, –2 are the values where f is undefined (UDF).
Mark these values on a real line.
(x – 3)
(x – 1)(x + 2) –2 1 3
UDF UDF f=0
–3
( – )
( – )( – )
= –
segment.
0 2 4
Test x = 0,
we've a
( – )
( – )( + )
= +
segment.
Sign–Charts and Inequalities I
44. Example D. Make the sign chart of f =
Select a point to sample in each segment:
Test x = –3,
we've a
(x – 3)
(x – 1)(x + 2)
The root for f = 0 is from the zero of the numerator
which is x = 3. The zeroes of the denominator
x = 1, –2 are the values where f is undefined (UDF).
Mark these values on a real line.
(x – 3)
(x – 1)(x + 2) –2 1 3
UDF UDF f=0
–3
( – )
( – )( – )
= –
segment.
0 2 4
Test x = 0,
we've a
( – )
( – )( + )
= +
segment.
Test x = 2,
we've a
( – )
( + )( + )
segment.
= –
Sign–Charts and Inequalities I
45. Example D. Make the sign chart of f =
Select a point to sample in each segment:
Test x = –3,
we've a
(x – 3)
(x – 1)(x + 2)
The root for f = 0 is from the zero of the numerator
which is x = 3. The zeroes of the denominator
x = 1, –2 are the values where f is undefined (UDF).
Mark these values on a real line.
(x – 3)
(x – 1)(x + 2) –2 1 3
UDF UDF f=0
–3
( – )
( – )( – )
= –
segment.
0 2 4
Test x = 0,
we've a
( – )
( – )( + )
= +
segment.
Test x = 2,
we've a
( – )
( + )( + )
segment.
= –
Test x = 4,
we've a
( + )
( + )( + )
segment.
= +
– – – – + + + – – – + + + +
Sign–Charts and Inequalities I
46. The easiest way to solve a polynomial or rational
inequality is to use the sign–chart.
Sign–Charts and Inequalities I
47. Example E. Solve x2 – 3x > 4
The easiest way to solve a polynomial or rational
inequality is to use the sign–chart.
Sign–Charts and Inequalities I
48. Example E. Solve x2 – 3x > 4
The easiest way to solve a polynomial or rational
inequality is to use the sign–chart. To do this,
I. set one side of the inequality to 0,
Sign–Charts and Inequalities I
49. Example E. Solve x2 – 3x > 4
The easiest way to solve a polynomial or rational
inequality is to use the sign–chart. To do this,
I. set one side of the inequality to 0,
Setting one side to 0, we have x2 – 3x – 4 > 0
Sign–Charts and Inequalities I
50. Example E. Solve x2 – 3x > 4
The easiest way to solve a polynomial or rational
inequality is to use the sign–chart. To do this,
I. set one side of the inequality to 0,
II. factor the expression
Setting one side to 0, we have x2 – 3x – 4 > 0
Sign–Charts and Inequalities I
51. Example E. Solve x2 – 3x > 4
The easiest way to solve a polynomial or rational
inequality is to use the sign–chart. To do this,
I. set one side of the inequality to 0,
II. factor the expression
Setting one side to 0, we have x2 – 3x – 4 > 0 or
(x – 4)(x + 1) > 0.
Sign–Charts and Inequalities I
52. Example E. Solve x2 – 3x > 4
The easiest way to solve a polynomial or rational
inequality is to use the sign–chart. To do this,
I. set one side of the inequality to 0,
II. factor the expression and draw the sign–chart,
Setting one side to 0, we have x2 – 3x – 4 > 0 or
(x – 4)(x + 1) > 0.
Sign–Charts and Inequalities I
53. Example E. Solve x2 – 3x > 4
The easiest way to solve a polynomial or rational
inequality is to use the sign–chart. To do this,
I. set one side of the inequality to 0,
II. factor the expression and draw the sign–chart,
Setting one side to 0, we have x2 – 3x – 4 > 0 or
(x – 4)(x + 1) > 0. The roots are x = –1, 4.
Sign–Charts and Inequalities I
54. Example E. Solve x2 – 3x > 4
4
–1
The easiest way to solve a polynomial or rational
inequality is to use the sign–chart. To do this,
I. set one side of the inequality to 0,
II. factor the expression and draw the sign–chart,
Draw the sign–chart, sample the points x = –2, 0, 5
(x – 4)(x + 1)
Setting one side to 0, we have x2 – 3x – 4 > 0 or
(x – 4)(x + 1) > 0. The roots are x = –1, 4.
Sign–Charts and Inequalities I
55. Example E. Solve x2 – 3x > 4
0 4
–1
–2 5
The easiest way to solve a polynomial or rational
inequality is to use the sign–chart. To do this,
I. set one side of the inequality to 0,
II. factor the expression and draw the sign–chart,
Draw the sign–chart, sample the points x = –2, 0, 5
(x – 4)(x + 1)
Setting one side to 0, we have x2 – 3x – 4 > 0 or
(x – 4)(x + 1) > 0. The roots are x = –1, 4.
Sign–Charts and Inequalities I
56. Example E. Solve x2 – 3x > 4
0 4
–1
–2 5
The easiest way to solve a polynomial or rational
inequality is to use the sign–chart. To do this,
I. set one side of the inequality to 0,
II. factor the expression and draw the sign–chart,
Draw the sign–chart, sample the points x = –2, 0, 5
(x – 4)(x + 1)
+ + +
Setting one side to 0, we have x2 – 3x – 4 > 0 or
(x – 4)(x + 1) > 0. The roots are x = –1, 4.
Sign–Charts and Inequalities I
57. Example E. Solve x2 – 3x > 4
0 4
–1
–2 5
The easiest way to solve a polynomial or rational
inequality is to use the sign–chart. To do this,
I. set one side of the inequality to 0,
II. factor the expression and draw the sign–chart,
Draw the sign–chart, sample the points x = –2, 0, 5
(x – 4)(x + 1)
+ + + – – – – – –
Setting one side to 0, we have x2 – 3x – 4 > 0 or
(x – 4)(x + 1) > 0. The roots are x = –1, 4.
Sign–Charts and Inequalities I
58. Example E. Solve x2 – 3x > 4
0 4
–1
–2 5
The easiest way to solve a polynomial or rational
inequality is to use the sign–chart. To do this,
I. set one side of the inequality to 0,
II. factor the expression and draw the sign–chart,
Draw the sign–chart, sample the points x = –2, 0, 5
(x – 4)(x + 1)
+ + + – – – – – – + + + +
Setting one side to 0, we have x2 – 3x – 4 > 0 or
(x – 4)(x + 1) > 0. The roots are x = –1, 4.
Sign–Charts and Inequalities I
59. Example E. Solve x2 – 3x > 4
0 4
–1
–2 5
The easiest way to solve a polynomial or rational
inequality is to use the sign–chart. To do this,
I. set one side of the inequality to 0,
II. factor the expression and draw the sign–chart,
III. read off the answer from the sign chart.
Draw the sign–chart, sample the points x = –2, 0, 5
(x – 4)(x + 1)
+ + + – – – – – – + + + +
Setting one side to 0, we have x2 – 3x – 4 > 0 or
(x – 4)(x + 1) > 0. The roots are x = –1, 4.
Sign–Charts and Inequalities I
60. Example E. Solve x2 – 3x > 4
0 4
–1
The solutions are the + regions:
–2 5
The easiest way to solve a polynomial or rational
inequality is to use the sign–chart. To do this,
I. set one side of the inequality to 0,
II. factor the expression and draw the sign–chart,
III. read off the answer from the sign chart.
Draw the sign–chart, sample the points x = –2, 0, 5
(x – 4)(x + 1)
+ + + – – – – – – + + + +
Setting one side to 0, we have x2 – 3x – 4 > 0 or
(x – 4)(x + 1) > 0. The roots are x = –1, 4.
Sign–Charts and Inequalities I
61. Example E. Solve x2 – 3x > 4
0 4
–1
The solutions are the + regions: (–∞, –1) U (4, ∞)
–2 5
4
–1
The easiest way to solve a polynomial or rational
inequality is to use the sign–chart. To do this,
I. set one side of the inequality to 0,
II. factor the expression and draw the sign–chart,
III. read off the answer from the sign chart.
Draw the sign–chart, sample the points x = –2, 0, 5
(x – 4)(x + 1)
+ + + – – – – – – + + + +
Setting one side to 0, we have x2 – 3x – 4 > 0 or
(x – 4)(x + 1) > 0. The roots are x = –1, 4.
Sign–Charts and Inequalities I
62. Example E. Solve x2 – 3x > 4
0 4
–1
The solutions are the + regions: (–∞, –1) U (4, ∞)
–2 5
4
–1
Note: The empty dot means those numbers are excluded.
The easiest way to solve a polynomial or rational
inequality is to use the sign–chart. To do this,
I. set one side of the inequality to 0,
II. factor the expression and draw the sign–chart,
III. read off the answer from the sign chart.
Draw the sign–chart, sample the points x = –2, 0, 5
(x – 4)(x + 1)
+ + + – – – – – – + + + +
Setting one side to 0, we have x2 – 3x – 4 > 0 or
(x – 4)(x + 1) > 0. The roots are x = –1, 4.
Sign–Charts and Inequalities I
63. Example F. Solve x – 2
2 <
x – 1
3
Sign–Charts and Inequalities I
64. Example F. Solve x – 2
2 <
x – 1
3
Set the inequality to 0, x – 2
2
x – 1
3
< 0
Sign–Charts and Inequalities I
65. Example F. Solve x – 2
2 <
x – 1
3
Set the inequality to 0, x – 2
2
x – 1
3
< 0
Put the expression into factored form,
Sign–Charts and Inequalities I
66. Example F. Solve x – 2
2 <
x – 1
3
Set the inequality to 0, x – 2
2
x – 1
3
< 0
Put the expression into factored form,
x – 2
2
x – 1
3
=
(x – 2)(x – 1)
2(x – 1) – 3(x – 2)
Sign–Charts and Inequalities I
67. Example F. Solve x – 2
2 <
x – 1
3
Set the inequality to 0, x – 2
2
x – 1
3
< 0
Put the expression into factored form,
x – 2
2
x – 1
3
=
(x – 2)(x – 1)
2(x – 1) – 3(x – 2)
=
(x – 2)(x – 1)
– x + 4
Sign–Charts and Inequalities I
68. Example F. Solve x – 2
2 <
x – 1
3
Set the inequality to 0, x – 2
2
x – 1
3
< 0
Put the expression into factored form,
x – 2
2
x – 1
3
=
(x – 2)(x – 1)
2(x – 1) – 3(x – 2)
=
(x – 2)(x – 1)
– x + 4
Hence the inequality is (x – 2)(x – 1)
– x + 4 < 0
Sign–Charts and Inequalities I
69. Example F. Solve x – 2
2 <
x – 1
3
Set the inequality to 0, x – 2
2
x – 1
3
< 0
Put the expression into factored form,
x – 2
2
x – 1
3
=
(x – 2)(x – 1)
2(x – 1) – 3(x – 2)
=
(x – 2)(x – 1)
– x + 4
Hence the inequality is (x – 2)(x – 1)
– x + 4 < 0
It has a root at x = 4, and it’s undefined at x = 1, 2.
Sign–Charts and Inequalities I
70. Example F. Solve x – 2
2 <
x – 1
3
Set the inequality to 0, x – 2
2
x – 1
3
< 0
Put the expression into factored form,
x – 2
2
x – 1
3
=
(x – 2)(x – 1)
2(x – 1) – 3(x – 2)
=
(x – 2)(x – 1)
– x + 4
Hence the inequality is (x – 2)(x – 1)
– x + 4 < 0
Draw the sign chart by sampling x = 0, 3/2, 3, 5
It has a root at x = 4, and it's undefined at x = 1, 2.
Sign–Charts and Inequalities I
71. Example F. Solve x – 2
2 <
x – 1
3
Set the inequality to 0, x – 2
2
x – 1
3
< 0
Put the expression into factored form,
x – 2
2
x – 1
3
=
(x – 2)(x – 1)
2(x – 1) – 3(x – 2)
=
(x – 2)(x – 1)
– x + 4
Hence the inequality is (x – 2)(x – 1)
– x + 4 < 0
Draw the sign chart by sampling x = 0, 3/2, 3, 5
It has a root at x = 4, and it's undefined at x = 1, 2.
4
1 2
UDF UDF
(x – 2)(x – 1)
– x + 4
Sign–Charts and Inequalities I
72. Example F. Solve x – 2
2 <
x – 1
3
Set the inequality to 0, x – 2
2
x – 1
3
< 0
Put the expression into factored form,
x – 2
2
x – 1
3
=
(x – 2)(x – 1)
2(x – 1) – 3(x – 2)
=
(x – 2)(x – 1)
– x + 4
Hence the inequality is (x – 2)(x – 1)
– x + 4 < 0
Draw the sign chart by sampling x = 0, 3/2, 3, 5
It has a root at x = 4, and it's undefined at x = 1, 2.
4
1
0 5
2
3/2 3
UDF UDF
(x – 2)(x – 1)
– x + 4
Sign–Charts and Inequalities I
73. Example F. Solve x – 2
2 <
x – 1
3
Set the inequality to 0, x – 2
2
x – 1
3
< 0
Put the expression into factored form,
x – 2
2
x – 1
3
=
(x – 2)(x – 1)
2(x – 1) – 3(x – 2)
=
(x – 2)(x – 1)
– x + 4
Hence the inequality is (x – 2)(x – 1)
– x + 4 < 0
Draw the sign chart by sampling x = 0, 3/2, 3, 5
It has a root at x = 4, and it's undefined at x = 1, 2.
4
1
0 5
+ + +
2
3/2 3
UDF UDF
(x – 2)(x – 1)
– x + 4
Sign–Charts and Inequalities I
74. Example F. Solve x – 2
2 <
x – 1
3
Set the inequality to 0, x – 2
2
x – 1
3
< 0
Put the expression into factored form,
x – 2
2
x – 1
3
=
(x – 2)(x – 1)
2(x – 1) – 3(x – 2)
=
(x – 2)(x – 1)
– x + 4
Hence the inequality is (x – 2)(x – 1)
– x + 4 < 0
Draw the sign chart by sampling x = 0, 3/2, 3, 5
It has a root at x = 4, and it's undefined at x = 1, 2.
4
1
0 5
+ + + – –
2
3/2 3
UDF UDF
(x – 2)(x – 1)
– x + 4
Sign–Charts and Inequalities I
75. Example F. Solve x – 2
2 <
x – 1
3
Set the inequality to 0, x – 2
2
x – 1
3
< 0
Put the expression into factored form,
x – 2
2
x – 1
3
=
(x – 2)(x – 1)
2(x – 1) – 3(x – 2)
=
(x – 2)(x – 1)
– x + 4
Hence the inequality is (x – 2)(x – 1)
– x + 4 < 0
Draw the sign chart by sampling x = 0, 3/2, 3, 5
It has a root at x = 4, and it's undefined at x = 1, 2.
4
1
0 5
+ + + – – + + + +
2
3/2 3
UDF UDF
(x – 2)(x – 1)
– x + 4
Sign–Charts and Inequalities I
76. Example F. Solve x – 2
2 <
x – 1
3
Set the inequality to 0, x – 2
2
x – 1
3
< 0
Put the expression into factored form,
x – 2
2
x – 1
3
=
(x – 2)(x – 1)
2(x – 1) – 3(x – 2)
=
(x – 2)(x – 1)
– x + 4
Hence the inequality is (x – 2)(x – 1)
– x + 4 < 0
Draw the sign chart by sampling x = 0, 3/2, 3, 5
It has a root at x = 4, and it's undefined at x = 1, 2.
4
1
0 5
+ + + – – + + + + – – – –
2
3/2 3
UDF UDF
(x – 2)(x – 1)
– x + 4
Sign–Charts and Inequalities I
77. Example F. Solve x – 2
2 <
x – 1
3
Set the inequality to 0, x – 2
2
x – 1
3
< 0
Put the expression into factored form,
x – 2
2
x – 1
3
=
(x – 2)(x – 1)
2(x – 1) – 3(x – 2)
=
(x – 2)(x – 1)
– x + 4
Hence the inequality is (x – 2)(x – 1)
– x + 4 < 0
Draw the sign chart by sampling x = 0, 3/2, 3, 5
It has a root at x = 4, and it's undefined at x = 1, 2.
4
1
0 5
+ + + – – + + + + – – – –
2
3/2 3
UDF UDF
(x – 2)(x – 1)
– x + 4
The answer are the shaded negative regions,
i.e. (1, 2) U [4 ∞).
Sign–Charts and Inequalities I
81. C. Solve the inequalities, use the answers from Ex.1.3.
Inequalities
82. (Answers to odd problems) Exercise A.
1.
3.
Sign-Charts and Inequalities
x = 2
x = –3
+ – +
x = 2
x = –3
– + –
UDF
5.
x = 0
x = –3
– + –
7.
x = –3
+ +
9.
x = 1/2
x = 0 x = 3
+ – + –
83. Sign-Charts and Inequalities
11.
x = 1/2
x = 0 x = 3
– – + –
13.
x = 1/2
x = 0 x = 3
+ + + +
15.
x = 0
x = -1 x = 3
+ – – +
17.
x = 3
x = 2
+ – +
UDF
19.
x = -3
+ – + –
x = -8 x = 2
UDF UDF
84. Sign-Charts and Inequalities
Exercise B.
1. (–∞, –3) ∪ (2, ∞) 3. [–3, 2] 5. (–∞, –3] ∪ [0, 2]
9. (–1, 3)
7. {0} ∪ [1/2, 3] 11. (–∞, –1) ∪ (0, 3)
13. (–∞, –2) ∪ (2, ∞) 15. (–∞, 2) ∪ [3, ∞)
17. (–8, –2) ∪ (4, ∞)
Exercise C.
1. The statement is not true. No such x exists.
3. (–∞, – 12/5) ∪ (2, ∞)
5. (2, 13/3]