Question

Let f(x)=2x+2. Solve f^-1(x) when x=4.
I believe I know how to do this problem, if someone would just walk through it with me.

Answer 1

First you need to find the inverse function. Do you know how to do that?

Answer 2

I believe so. My first step to finding the inverse function would be to replace f^-1 with y and then switch my x and y variables right? @Tommynaiter

Answer 3

Yes, that is correct. You switch x and y and then isolate y. If you do this, what function do you get then?

Answer 4

I got

Answer 5

Yeap! That is the inverse function, now you just insert 4 and solve it :)

Answer 6

Yes

Answer 7

Thank you! @Tommynaiter

Answer 8

You're welcome :)