3 x + 4
x^3 + 4
/ 2/3 2/3 ___\ / 2/3 2/3 ___\ / 2/3\ | 2 I*2 *\/ 3 | | 2 I*2 *\/ 3 | \x + 2 /*|x + - ---- + ------------|*|x + - ---- - ------------| \ 2 2 / \ 2 2 /
((x + 2^(2/3))*(x - 2^(2/3)/2 + i*2^(2/3)*sqrt(3)/2))*(x - 2^(2/3)/2 - i*2^(2/3)*sqrt(3)/2)
4.0 + x^3