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