Question

What is f(x)=5x, what is f-1 (x)?

Answer 1

let f (x) = y

$y = 5x \\ \\ x = \frac{y}{5} \\ \\ {f}^{ - 1} (y) = \frac{y}{5} \\ \\ {f}^{ - 1} (x) = \frac{x}{5}$

hope it helps.