Study these examples: Synthetic Division
Then, try a few of yours and see how far you get.
x 4 + 81 / x - 3
x 4 - 81 / x - 3
5x 3 - 12x 2 - 36x -16 /x + 2
x 5 - 8x 3 + 24x 2 + 12x + 40 / x + 4
x 4 - 3x 3 + 3x 2 - 3x + 6 /x - 2
I try to Dividing them but i all ways get them wrong and it say that i have to use Synthetic division
Study these examples: Synthetic Division
Then, try a few of yours and see how far you get.