Question

Let f(x) = x^2 - 2x. What is the value of f(2)?

Answer 1

A: 0 because if you replace all the x's with 2 you would have 2^2-2*2 which equals 4-4=0

Answer 2

This is stating that, if x was 2, what is the answer to the equation. 
So basically, the equation is 2^2 - 2(2) = ? 
The first step is 2 squared, which is 4, then you subtract 2(2) or 4. So 4-4 is 0. 
The value of f(2) is 0 
A would be correct.