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 + x*(1 + 2*x)
1.0 + x + 2.0*x^2