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.
You can just leave it blank... It's not really necessary :) <span />
