Find algebraically the zeros for p(x)= x^3+x^2-4x-4
x^3+x^2-4x-4 = 0 factor
x^2(x + 1) - 4 (x + 1) = 0
(x + 1) (x^2- 4) = 0
(x + 1) (x + 2) ( x - 2) = 0
Set each factor to 0 and x = -1, x = -2 or x = 2