2 x + 4*x - 4
x^2 + 4*x - 4
/ ___\ / ___\ \x + 2 - 2*\/ 2 /*\x + 2 + 2*\/ 2 /
(x + 2 - 2*sqrt(2))*(x + 2 + 2*sqrt(2))
2 -4 + x + 4*x
-4 + x^2 + 4*x
-4.0 + x^2 + 4.0*x
-4 + x*(4 + x)