You can put this solution on YOUR website! A bit tricky to do here, but here goes
-5 | 16 80 1 5
80 0 -5
----------------------
16 0 1 | 0
and our answer is
16x^2 + 1
You can put this solution on YOUR website! The synthetic division table is:
the test zero, is from | at the left, and the coefficients ONLY of given polynomial from | at the right
|........ ..........
...............................
.............................
So we have