Question

Evaluate the function f(x)= f(x)=2x-2, when x=-1

Answer 1

f(x)=2x-2, when x=-1
f(-1)=2(-1)-2
f(-1)=-2-2
f(-1)=-4

Answer 2

So what you want to do is plug -1 in for x and evaluate, then the answer you get from the first equation you plug in again since it says f(x)=f(x).