For the function f(x) = x2 ­ -12, find (f o f­-1)(4) a. 0 b. 4 c. 10 d. 6

We actually don't need to do any computation. By definition, the inverse function changes the role of input and output. So, if a function f maps x onto y, the inverse function maps y onto x.

You have to think like this: if the function makes a step further, the inverse function makes that same step back.

This means that the composition is always the identity function . In fact,

So, for every function, you have

what i would say the best answer is a. 40.5

answer:   y=2x-3

step-by-step explanation: