2 x + 2*x + 7
x^2 + 2*x + 7
2 7 + x + 2*x
7 + x^2 + 2*x
/ ___\ / ___\ \x + 1 + I*\/ 6 /*\x + 1 - I*\/ 6 /
(x + 1 + i*sqrt(6))*(x + 1 - i*sqrt(6))
7.0 + x^2 + 2.0*x
7 + x*(2 + x)