3 2 x + 3*x - 4
x^3 + 3*x^2 - 1*4
1*(x + 2)*(x - 1)
(1*(x + 2))*(x - 1)
-4.0 + x^3 + 3.0*x^2
2 (2 + x) *(-1 + x)
(2 + x)^2*(-1 + x)