3 2 x + 4*x - 4*x - 16
x^3 + 4*x^2 - 4*x - 16
3 2 -16 + x - 4*x + 4*x
-16 + x^3 - 4*x + 4*x^2
(x + 4)*(x + 2)*(x - 2)
((x + 4)*(x + 2))*(x - 2)
(-2 + x)*(2 + x)*(4 + x)
-16.0 + x^3 + 4.0*x^2 - 4.0*x
-16 + x*(-4 + x*(4 + x))