### Home > CCA > Chapter 11 > Lesson 11.1.2 > Problem11-20

11-20.

For each function, find the inverse function.

1.  $f(x)=2x+3$

Write down the steps of the original function.
1. Multiply by $2$.
2. Add $3$.

Write down the steps that will 'undo' the original function.
1. Subtract $3$.
2. Divide by $2$.

Write the equation for the inverse function using what you wrote in Step 2.

$\textit{f}^{-1}(x)=\frac{\textit{x}-3}{2}$

1.  $g\left(x\right)=\frac{x-5}{4}$

Follow the steps in part (a) when writing down the steps of the original function, which comes first, dividing by $4$ or subtracting 5?