This one has most of us in class scratching our heads. I not looking for a full solution, just a way to get started. If I can get the form for P I think I can get it from there. Here's the problem:
I did find a solution online, but I didn't understand it, so it's not really useful to me. They started like this
But I don't understand how they got that nor how they used it in the rest of their solution. (Judging by the rest of the solution, I think that last isn't x^n but x^T ... I think - handwriting).
Can anyone offer some advice?