2 2*x + 3
2*x^2 + 3
/ ___\ / ___\ | I*\/ 6 | | I*\/ 6 | |x + -------|*|x - -------| \ 2 / \ 2 /
(x + i*sqrt(6)/2)*(x - i*sqrt(6)/2)
3.0 + 2.0*x^2