3 2 x + 2*x - 4*x - 8
x^3 + 2*x^2 - 4*x - 1*8
1*(x + 2)*(x - 2)
(1*(x + 2))*(x - 2)
-8.0 + x^3 + 2.0*x^2 - 4.0*x
2 (2 + x) *(-2 + x)
(2 + x)^2*(-2 + x)