Explanation

An inverse function undoes what the original function does.

Example:
f(x) = x + 4
Inverse = subtract 4

Why?

• Add 4 → subtract 4 brings you back

A function is invertible if:

• Every output comes from only one input

Simple rule:

• If a function can be undone, it has an inverse

Quiz: Invertible Functions

1. What does an inverse function do?

2. What is the inverse of adding 5?

3. Can every function have an inverse?

4. What must be true for a function to be invertible?

5. True or False: An inverse reverses the original function.

Answer Key

1. Undoes the original function

2. Subtract 5

3. No

4. Each output comes from one input

5. True