I've got a decent hold on this crap finally. However, if you look at the picture my answer is wrong. My -1 should be positive. I understand where to make the change to make it right, I just don't understand why. Anyone brave enough to explain? I know that line 5 should read (x-1/2)^2 but why? I'm sure it has something to do with the form of the equation on line 4 (second and third coeff signs). If someone could point me to the rule or whatever I'm missing I'd be very pleased.