2 x + 2*x + 6
x^2 + 2*x + 6
2 6 + x + 2*x
6 + x^2 + 2*x
/ ___\ / ___\ \x + 1 + I*\/ 5 /*\x + 1 - I*\/ 5 /
(x + 1 + i*sqrt(5))*(x + 1 - i*sqrt(5))
6.0 + x^2 + 2.0*x
6 + x*(2 + x)