3 2 z - z - 5*z + 125
z^3 - z^2 - 5*z + 125
3 2 125 + z - z - 5*z
125 + z^3 - z^2 - 5*z
(x + 5)*(x + -3 + 4*I)*(x + -3 - 4*I)
((x + 5)*(x - 3 + 4*i))*(x - 3 - 4*i)
125.0 + z^3 - z^2 - 5.0*z
125 + z*(-5 + z*(-1 + z))
/ 2 \ (5 + z)*\25 + z - 6*z/
(5 + z)*(25 + z^2 - 6*z)