2 x - 4*x + 6
x^2 - 4*x + 6
2 6 + x - 4*x
6 + x^2 - 4*x
/ ___\ / ___\ \x + -2 + I*\/ 2 /*\x + -2 - I*\/ 2 /
(x - 2 + i*sqrt(2))*(x - 2 - i*sqrt(2))
6 + x*(-4 + x)
6.0 + x^2 - 4.0*x