I don't know what these people are doing on this site. I would never want them to even help my 6 year-old.
Since it's being divided by x - 3, then the remainder will be p(3).
With polynomial being, we get:
p(3) = 2(81) - 3(27) + 4(9) - 15 + 6
p(3) = 162 - 81 + 36 - 15 + 6
p(3), or