This document discusses solving quadratic equations by factoring. It provides examples of quadratic equations in standard form and using the zero factor property to solve for the roots. The steps for solving a quadratic equation by factoring are outlined. Additional examples are provided solving quadratic equations that arise in applied problems using factoring techniques.
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You've seen that many quantities are related to each other. However, not all of them are directly related. Now you will explore quantities that vary inversely. In inverse variation, one quantity decreases as the other increases.
You've seen that many quantities are related to each other. However, not all of them are directly related. Now you will explore quantities that vary inversely. In inverse variation, one quantity decreases as the other increases.
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Question 11. Determine which of the following points lies on .docxmakdul
Question 1
1. Determine which of the following points lies on the graph of the equation:
(0,7)
(0,6)
(0,5)
(6,5)
(1,5)
Question 2
Complete the table. Use the resulting solution points to sketch the graph of the equation.
Question3
Graphically estimate the x- and y- intercepts of the graph:
y = x3 - 9x
x-intercept: (±3,0),(0,0)
y-intercept: (0,0)
x-intercept: (3,0),(0,0)
y-intercept: (0,0)
x-intercept: (-3,0),(0,0)
y-intercept: (0,0)
x-intercept: (0,±3),(0,0)
y-intercept: (0,0)
x-intercept (0,3),(0,0)
y-intercept (0,0)
Question 4
Find the x- and y-intercepts of the graph of the equation
y=49-7x
x-intercept: (7,0)
y-intercept: (0,-7)
x-intercept: (49,0)
y-intercept: (0,7)
x-intercept: (-7,0)
y-intercept: (0,-49)
x-intercept: (49,0)
y-intercept: (0,49)
x-intercept: (7,0)
y-intercept: (0,49)
Question 5
Determine whether the value of x=7 is a solution of the equation:
2.
no
yes
Question 6
Solve the equation 8-5x=6
Question 7
Solve the equation and check your solution.
-2-4x=30
9
-11
-8
7
-10
Question 8
Solve the equation and check your solution.
5y + 1 = 6y - 5 + 8y
2/3
3/2
6/5
5/6
-2/3
Question 9
Solve the equation and check your solution.
67x - 24 = 3x + 8(8x-3)
3
67
-3
-67
All real numbers
Question 10
Solve the equation and check your solution.
10
6
7
9
8
Question 11
Solve the equation and check your solution. (If not possible, explain why.)
2
5
6
4
10
Question 12
3.
4. Solve the equation and check your solution. (If not possible, explain why)
5.
-18
7
11
No solution. The variable is divided out.
20
Question 13
Write the quadratic equation in general form.
4x2 = 8 - 9x
4x2 + 9x + 8 = 0
4x2 + 9x = -8
4x2 - 9x - 8 = 0
-4x2 + 9x - 8 = 0
4x2 + 9x - 8 = 0
Question 14
Solve the quadratic equation by factoring.
x2 - 6x + 5 = 0
-1, 5
-1,-5
1,-5
1,5
6,5
Question 15
Solve the quadratic equation by factoring.
x2 + 8x + 16 = 0
4
-1/4
-4
±4
1/4
Question 16
Solve the equation by extracting square roots.
(x+6)2 = 5
6 + √5
-6 ± √5
-6 -√5
6 ± √5
-6 + √5
Question 17
Use the Quadratic Formula to solve
x2 + 20x + 98 = 0
x = -8, x = -12
x = -√2 - 10, x = √2 - 10
x = -√3 - 10, x = √3 - 10
x = 10, x = -10
x = -√2 - 9, x = √2 - 9
Question 18
Write the complex number in standard form.
√ -9
3i
-3i
9i
4i
-9i
Question 19
Find real numbers a and b such that the equation is true.
a + bi = 14 + 2i
a=16, b=4
a=18, b=6
a=14, b=2
a=15, b=14
a=17, b=5
Question 20
Find all solutions to the following equation.
x = -17/4
x=9
no solution
x=-17
x=-8
Question 1
1. Determine which ...
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1. 11.6 – Solving Quadratic Equations by Factoring
A quadratic equation is written in the Standard
Form, 2
0ax bx c+ + =
where a, b, and c are real numbers and .0a ≠
Examples:
2
7 12 0x x− + =
2
3 4 15x x+ =
( )7 0x x + =
(standard form)
2. Zero Factor Property:
If a and b are real numbers and if ,0ab =
Examples:
( )7 0x x + =
then or .0a = 0b =
0x = 7 0x + =
7x = −0x =
11.6 – Solving Quadratic Equations by Factoring
3. Zero Factor Property:
If a and b are real numbers and if ,0ab =
Examples:
( ) ( )10 3 6 0x x− − =
then or .0a = 0b =
10 0x − = 3 6 0x − =
10x =
3 6x = 2x =
10 10 01 0x − =+ + 63 66 0x − + = +
3 6
3 3
x
=
11.6 – Solving Quadratic Equations by Factoring
4. Solving Quadratic Equations:
1) Write the equation in standard form.
4) Solve each equation.
2) Factor the equation completely.
3) Set each factor equal to 0.
5) Check the solutions (in original equation).
11.6 – Solving Quadratic Equations by Factoring
12. 0 =
A cliff diver is 64 feet above the surface of the
water. The formula for calculating the height (h)
of the diver after t seconds is: 2
16 64.h t= − +
How long does it take for the diver to hit the
surface of the water?
0 =
0 =
2 0t + = 2 0t − =
2t = − 2t = seconds
2
16 64t− +
16− ( )2
4t −
16− ( )2t + ( )2t −
11.7 – Quadratic Equations and Problem Solving
13. 2
x
The square of a number minus twice the number is
63. Find the number.
( )7x +
7x = −
x is the number.
2
2 63 0x x− − =
7 0x + = 9 0x − =
9x =
2x− 63=
63:Factors of 1, 63 3, 21 7, 9
( )9x − 0=
11.7 – Quadratic Equations and Problem Solving
14. ( )5 176w w+ =
The length of a rectangular garden is 5 feet more than
its width. The area of the garden is 176 square feet.
What are the length and the width of the garden?
( )11w−
The width is w.
11 0w− =
11w =
The length is w+5.l w A× =
2
5 176w w+ =
2
5 176 0w w+ − =
16 0w+ =
16w = −
11w = 11 5l = +
16l =
feet
feet
176:Factors of
1,176 2, 88 4, 44
8, 22 11,16
( )16w+ 0=
11.7 – Quadratic Equations and Problem Solving
15. x
Find two consecutive odd numbers whose product is
23 more than their sum?
Consecutive odd numbers: x
5x = − 5x =2
2 2 25x x x+ = +
2
25 0x − =
( )5x +
5 0x + = 5 0x − =
5, 3− − 5, 7
5 2 3− + = − 5 2 7+ =
2.x +
( )2x + = ( )2x x+ + 23+
2
22 2 2 25xx x x x+ = −+−
2
25 2525x =− −
2
25x =
( )5x − 0=
11.7 – Quadratic Equations and Problem Solving
16. a x=
The length of one leg of a right triangle is 7 meters less than
the length of the other leg. The length of the hypotenuse is 13
meters. What are the lengths of the legs?
12a =
( ).Pythagorean Th
( )
22 2
7 13x x+ − =
5x = −
5=
meters
7b x= − 13c =
2 2
14 49 169x x x+ − + =
2
2 14 120 0x x− − =
( )2
2 7 60 0x x− − =
2
5 0x + = 12 0x − =
12x =
12 7b = − meters
2 2 2
a b c+ =
60:Factors of 1, 60 2, 30
3, 20 4,15 5,12
( )5x + ( )12x − 0=
6,10
11.7 – Quadratic Equations and Problem Solving