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