3 2 z - 6*z + 5*z + 12
z^3 - 6*z^2 + 5*z + 12
(x + 1)*(x - 3)*(x - 4)
((x + 1)*(x - 3))*(x - 4)
3 2 12 + z - 6*z + 5*z
12 + z^3 - 6*z^2 + 5*z
12.0 + z^3 + 5.0*z - 6.0*z^2
12 + z*(5 + z*(-6 + z))
(1 + z)*(-4 + z)*(-3 + z)