The document discusses inverse functions. It defines inverse functions as pairs of one-to-one functions that undo each other. To find the inverse of a function, interchange the x and y variables and solve for y. The graph of an inverse function is a reflection of the original function across the line y = x. Examples are provided to illustrate how to determine if a function is one-to-one, find the inverse function, and relate the graph of a function to its inverse.
Gives idea about function, one to one function, inverse function, which functions are invertible, how to invert a function and application of inverse functions.
Gives idea about function, one to one function, inverse function, which functions are invertible, how to invert a function and application of inverse functions.
Basic Calculus 11 - Derivatives and Differentiation RulesJuan Miguel Palero
It is a powerpoint presentation that discusses about the lesson or topic of Derivatives and Differentiation Rules. It also encompasses some formulas, definitions and examples regarding the said topic.
* Verify inverse functions.
* Determine the domain and range of an inverse function, and restrict the domain of a function to make it one-to-one.
* Find or evaluate the inverse of a function.
* Use the graph of a one-to-one function to graph its inverse function on the same axes.
Basic Calculus 11 - Derivatives and Differentiation RulesJuan Miguel Palero
It is a powerpoint presentation that discusses about the lesson or topic of Derivatives and Differentiation Rules. It also encompasses some formulas, definitions and examples regarding the said topic.
* Verify inverse functions.
* Determine the domain and range of an inverse function, and restrict the domain of a function to make it one-to-one.
* Find or evaluate the inverse of a function.
* Use the graph of a one-to-one function to graph its inverse function on the same axes.
* Model exponential growth and decay
* Use Newton's Law of Cooling
* Use logistic-growth models
* Choose an appropriate model for data
* Express an exponential model in base e
* Construct perpendicular and angle bisectors
* Use bisectors to solve problems
* Identify the circumcenter and incenter of a triangle
* Use triangle segments to solve problems
* Identify, write, and analyze conditional statements
* Write the inverse, converse, and contrapositive of a conditional statement
* Write a counterexample to a fake conjecture
* Find the distance between two points
* Find the midpoint of two given points
* Find the coordinates of an endpoint given one endpoint and a midpoint
* Find the coordinates of a point a fractional distance from one end of a segment
* Connect functions to their graphs
* Graph piecewise-defined functions
* Graph absolute value functions
* Graph greatest-integer functions
* Interpret graphs
* Use the vertical line test to determine a function
* Connect functions to their graphs
* Graph piecewise-defined functions
* Graph absolute value functions
* Graph greatest-integer functions
* Interpret graphs
* Use the vertical line test to determine a function
* Introduce functions and function notation
* Develop skills in constructing and interpreting the graphs of functions
* Learn to apply this knowledge in a variety of situations
* Recognize graphs of common functions.
* Graph functions using vertical and horizontal shifts.
* Graph functions using reflections about the x-axis and the y-axis.
* Graph functions using compressions and stretches.
* Combine transformations.
* Identify intervals on which a function increases, decreases, or is constant
* Use graphs to locate relative maxima or minima
* Test for symmetry
* Identify even or odd functions and recognize their symmetries
* Understand and use piecewise functions
* Solve polynomial equations by factoring
* Solve equations with radicals and check the solutions
* Solve equations with rational exponents
* Solve equations that are quadratic in form
* Solve absolute value equations
* Determine whether a relation or an equation represents a function.
* Evaluate a function.
* Use the vertical line test to identify functions.
* Identify the domain and range of a function from its graph
* Identify intercepts from a function’s graph
* Solve counting problems using the Addition Principle.
* Solve counting problems using the Multiplication Principle.
* Solve counting problems using permutations involving n distinct objects.
* Solve counting problems using combinations.
* Find the number of subsets of a given set.
* Solve counting problems using permutations involving n non-distinct objects.
* Use summation notation.
* Use the formula for the sum of the first n terms of an arithmetic series.
* Use the formula for the sum of the first n terms of a geometric series.
* Use the formula for the sum of an infinite geometric series.
* Solve annuity problems.
* Find the common ratio for a geometric sequence.
* List the terms of a geometric sequence.
* Use a recursive formula for a geometric sequence.
* Use an explicit formula for a geometric sequence.
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2. Concepts & Objectives
Inverse Functions
Review composition of functions
Identify 1-1 functions
Find the inverse of a 1-1 function
3. Composition of Functions
If f and g are functions, then the composite function, or
composition, of g and f is defined by
The domain of g f is the set of all numbers x in the
domain of f such that f x is in the domain of g.
g f x g f x
4. Composition of Functions (cont.)
Example: Let and .
c) Write as one function.
2 1
f x x
4
1
g x
x
f g x
5. Composition of Functions (cont.)
Example: Let and .
c) Write as one function.
2 1
f x x
4
1
g x
x
f g x
f g x f g x
4
2 1
1
x
8
1
1
x
8 1 8 1
1 1 1
x x
x x x
9
1
x
x
6. One-to-One Functions
In a one-to-one function, each x-value corresponds to
only one y-value, and each y-value corresponds to only
one x-value. In a 1-1 function, neither the x nor the y can
repeat.
We can also say that f a = f b implies a = b.
A function is a one-to-one function if, for
elements a and b in the domain of f,
a ≠ b implies f a ≠ f b.
8. One-to-One Functions (cont.)
Example: Decide whether is one-to-one.
We want to show that f a = f b implies that a = b:
Therefore, f is a one-to-one function.
3 7
f x x
f a f b
3 7 3 7
a b
3 3
a b
a b
10. One-to-One Functions (cont.)
Example: Decide whether is one-to-one.
This time, we will try plugging in different values:
Although 3 ≠ ‒3, f 3 does equal f ‒3. This means that
the function is not one-to-one by the definition.
2
2
f x x
2
3 3 2 11
f
2
3 3 2 11
f
11. One-to-One Functions (cont.)
Another way to identify whether a function is one-to-one
is to use the horizontal line test, which says that if any
horizontal line intersects the graph of a function in more
than one point, then the function is not one-to-one.
one-to-one not one-to-one
12. Inverse Functions
Some pairs of one-to-one functions undo one another.
For example, if
and
then (for example)
This is true for any value of x. Therefore, f and g are
called inverses of each other.
8 5
f x x
5
8
x
g x
8 10 8
10 5 5
f
85 5 80
8
8
8
10
5
g
13. Inverse Functions (cont.)
More formally:
Let f be a one-to-one function. Then g is the inverse
function of f if
for every x in the domain of g,
and for every x in the domain of f.
f g x x
g f x x
14. Inverse Functions (cont.)
Example: Decide whether g is the inverse function of f .
3
1
f x x
3
1
g x x
15. Inverse Functions (cont.)
Example: Decide whether g is the inverse function of f .
yes
3
1
f x x
3
1
g x x
3
3
1 1
f g x x
1 1
x
x
3 3
1 1
g f x x
3 3
x
x
16. Inverse Functions (cont.)
If g is the inverse of a function f , then g is written as f -1
(read “f inverse”).
In our previous example, for ,
3
1
f x x
1 3
1
f x x
17. Finding Inverses
Since the domain of f is the range of f -1 and vice versa, if
a set is one-to-one, then to find the inverse, we simply
exchange the independent and dependent variables.
Example: If the relation is one-to-one, find the inverse of
the function.
2,1 , 1,0 , 0,1 , 1,2 , 2,2
F not 1-1
3,1 , 0,2 , 2,3 , 4,0
G 1-1
1
1,3 , 2,0 , 3,2 , 0,4
G
18. Finding Inverses (cont.)
In the same way we did the example, we can find the
inverse of a function by interchanging the x and y
variables.
To find the equation of the inverse of y = f x:
Determine whether the function is one-to-one.
Replace f x with y if necessary.
Switch x and y.
Solve for y.
Replace y with f -1x.
19. Finding Inverses (cont.)
Example: Decide whether each equation defines a one-
to-one function. If so, find the equation of the inverse.
a) 2 5
f x x
20. Finding Inverses (cont.)
Example: Decide whether each equation defines a one-
to-one function. If so, find the equation of the inverse.
a) one-to-one
replace f x with y
interchange x and y
solve for y
replace y with f -1x
2 5
f x x
2 5
y x
2 5
x y
2 5
y x
5
2
x
y
1 1 5
2 2
f x x
21. Graphing Inverses
Back in Geometry, when we studied reflections, it turned
out that the pattern for reflecting a figure across the line
y = x was to swap the x- and y-values.
It turns out, if we were to graph our inverse functions,
we would see that the inverse is the reflection of the
original function across the line y = x.
This can give you a way to check your work.
, ,
x y y x
22. Graphing Inverses
2 5
f x x
3
2
f x x
1 1 5
2 2
f x x
1 3
2
f x x