let's start thinking about that for a second three x squared squared well that's going to be nine x to the fourth so it's going to be times nine x to the fourth minus the product of these two things so minus the product of five and three x squared so minus fifteen x squared and then finally plus b squared b is five so it's going to be five squared so plus twenty five when I said b is this is b - not the whole five to the third and when I say a just this part is a