Question

Given the function f(x) = 2x, find the value of f−1(16)

Answer 1

say, f(x)=y
so y=2x
to find the inverse function, always interchange x and y
so the inverse function is 2y=x
or, y=x/2
so f^-1 (x)=x/2
so f-1 (16)=16/2=8

Answer 2

Thank you :) could you help with another?

Answer 3

please post a separate question. thank you!