3 z + 8
z^3 + 8
/ ___\ / ___\ (x + 2)*\x + -1 + I*\/ 3 /*\x + -1 - I*\/ 3 /
((x + 2)*(x - 1 + i*sqrt(3)))*(x - 1 - i*sqrt(3))
8.0 + z^3
/ 2 \ (2 + z)*\4 + z - 2*z/
(2 + z)*(4 + z^2 - 2*z)