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### Inverse Functions

Section 1.8

Objectives

- Determine if a function given as an equation is one-to-one.
- Determine if a function given as a graph is one-to-one.
- Algebraically find the inverse of a one-to-one function given as an equation.
- State the domain and range of a function and it inverse.

Objectives

- State the relationships between the domain and range of a function and its inverse
- Restrict the domain of a function that is not one-to-one so that an inverse function can be found.
- Draw the graph of the inverse function given the graph of the function.

Vocabulary

- inverse function
- horizontal line test
- function composition
- one-to-one function

Given the functions and find each of the following:

Steps for finding an inverse function.

- Change the function notation f(x) to y.
- Change all the x’s to y’s and y’s to x’s.
- Solve for y.
- Replace y with f -1(x).

Find the inverse of the function

Find the domains of the function and its inverse.

Find the inverse of the function

Find the domains of the function and its inverse.

Find the inverse of the function

Find the domains of the function and its inverse.

Find the inverse of the function

Find the domains of the function and its inverse.

The function is not one-to-one. Choose the largest possible domain containing the number 100 so that the function restricted to the domain is one-to-one. Find the inverse function for that restricted function.

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