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