Also, to the OP, you realize that some of your problems are multiplication.
I'm not going to attempt to even solve one, because I have no idea how to do it in LaTex. I'll just give a couple of hints. When you divide by (x - k), the k goes in the "box." And don't forget to put zeros for any "missing" terms. So for #7, for example, the set up would be
-1| 1 -7 0 8
... because , and there was no x-term in . Now you try.