### Home > CCA2 > Chapter 8 > Lesson 8.1.1 > Problem8-12

8-12.
1. A table can be used as a useful tool for finding some inverse functions. When the function has only one x in it, the function can be described with a sequence of operations, each applied to the previous result. Consider the following table for f(x) = 2 + 3. Homework Help ✎

 1st 2nd 3rd 4th What f does to x: subtracts 1 multiplies by 2 adds 3

Since the inverse must undo these operations, in the opposite order, the table for f −1(x) would look like the one below.

 1st 2nd 3rd 4th What f−1 does to x: subtracts 3 divides by 2 ( )2 adds 1
1. Copy and complete the following table for g1(x) if g(x) = (x + 1)2 − 2 for x ≥ –1.

 1st 2nd 3rd 4th What g does to x: adds 1 ( )2 divides by 3 subtracts 2 What g−1 does to x:
2. Write the equations for f −1(x) and g1(x).

$f^{-1}(x)=\left(\frac{x-3}{2}\right)^2+1$