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# Bell Ringer - PowerPoint PPT Presentation

Bell Ringer. What do you think “inverse” means? What is the rule for reflection over the line y = x? Find the “sin” button on your calculator. What is written above it? . Inverse Functions. Thursday, March 13, 2014. The Basics.

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Presentation Transcript

What do you think “inverse” means?

What is the rule for reflection over the line y = x?

Find the “sin” button on your calculator. What is written above it?

### Inverse Functions

Thursday, March 13, 2014

The inverse of a function is when you switch the x and y values.

The graph of inverse functions is a reflection over the line y = x.

Inverse function notation is f -1(x).

Find the inverse of the given function:

f = {(1,2), (3,5), (-2,-5), (-7, 4)}

The inverse is:

f -1 = {(2,1), (5,3), (-5,-2), (4, -7)}

(See Graphic Organizer)

Switch to the y = notation from the f(x) =.

Exchange x and y in the problem and solve for y.

Rewrite as f -1(x).

Ex: Solving Algebraicallyf(x) = 3x2 - 8

• Switch notation

• Switch x & y and solve for y

• Add 8 to both sides

• Divide both sides by 3

• Take the square root

• Rewrite in function notation

• y = 3x2 – 8

• x = 3y2 – 8

• x + 8 = 3y2

• x + 8 = y2

3

√ (x + 8) = y

3

f -1(x) = ± √ (x + 8)

3

• f(x) = √x

• y = √x

• x = √y

• x2 = y

• f -1 (x) = x2

• Copy

• Rewrite in y = form

• Switch x and y & solve for y

• Square both sides

• Write in function notation

If a function has a limited range, then the domain of its inverse is limited.

f(x) = √x

The range of this function is y ≥ 0

This means the inverse function has a limited domain of x ≥ 0

So, f -1(x) = x2, x ≥ 0

Classwork – Worksheet 7.4 Inverse Functions

Homework – Practice Problems (25)

What are the 3 ways to determine the inverse of a function?

Which way do you find easiest? Explain.