Question

Let f(x) = 5x + 12. Find f-1(x)

Answer 1

\[
f(f^{-1}(x)) = x = 5[f^{-1}(x)]+12
\]We use \[
x = 5[f^{-1}(x)]+12
\]And solve for \(f^{-1}(x)\)

Answer 2

In this case we start by subtracting 12: \[
5f^{-1}(x) = x-12
\]

Answer 3

next step is division by 5.