2 3*x - x - 1
3*x^2 - x - 1
/ ____\ / ____\ | 1 \/ 13 | | 1 \/ 13 | |x + - - + ------|*|x + - - - ------| \ 6 6 / \ 6 6 /
(x - 1/6 + sqrt(13)/6)*(x - 1/6 - sqrt(13)/6)
2 -1 - x + 3*x
-1 - x + 3*x^2
-1.0 - x + 3.0*x^2
-1 + x*(-1 + 3*x)