Question

Let f(x) = x2 – 16. Find f–1(x)

Answer 1

$$
f(x) = x^2 – 16 \implies \color{blue}{y}= \color{red}{x}^2 – 16\\
\text{do a "switcharoo" on the letters}\\
f^{-1}(x) \implies \color{red}{x} = \color{blue}{y}^2 – 16\\
\text{solve for "y" to get }f^{-1}(x)
$$