Use synthetic division to determine which of the following is a factor of
6x^4 - x^3 - 66x^2 + 121x - 60
a. (x-5/2)
b. (x+3/2)
c. (x+1)
d. (x-4)

use synthetic division to determine which of the following is a factor of
7x^4 - 8x^3 - 167x^2 - 228x +36
a. (x-1/7)
b. (x-3)
c. (x+6)
d. (x-2)