Question

Which polynomial is NOT a factor of

3x^4 - 16x^3 - 3x^2 + 36x + 20

A) x-5
B) x+1
C) 3x+2
D) x-1

Answer 1

Do you know synthetic division?

Answer 2

Evaluate the polynomial at 5, -1, -2/3, and 1.
Whichever one does not evaluate to zero is the answer.

Answer 3

you can do it really easily by doing synthetic division, like this: