3 z + I
z^3 + i
/ ___\ / ___ \ | I \/ 3 | | \/ 3 I| (x - I)*|x + - + -----|*|x + - ----- + -| \ 2 2 / \ 2 2/
((x - i)*(x + i/2 + sqrt(3)/2))*(x - sqrt(3)/2 + i/2)
i + z^3