2 2*x - x + 1
2*x^2 - x + 1
2 1 - x + 2*x
1 - x + 2*x^2
/ ___\ / ___\ | 1 I*\/ 7 | | 1 I*\/ 7 | |x + - - + -------|*|x + - - - -------| \ 4 4 / \ 4 4 /
(x - 1/4 + i*sqrt(7)/4)*(x - 1/4 - i*sqrt(7)/4)
1.0 - x + 2.0*x^2
1 + x*(-1 + 2*x)