Question

Find a if X + a is a factor of polynomial x cube + x square - 2 X + A + 4

Answer 1

x=-a

(-a)^3 +(-a)^2 - 2 (-a) + a + 4

-a + a +2 a + 4

2 a +4 = 0

2a = -4

a = -4/2

a = -2