2 -12 + x *(1 + x)
/ 2 \ (-2 + x)*\6 + x + 3*x/
/ ____\ / ____\ | 3 I*\/ 15 | | 3 I*\/ 15 | (x - 2)*|x + - + --------|*|x + - - --------| \ 2 2 / \ 2 2 /