2 x + 4*x - 3
x^2 + 4*x - 3
2 -3 + x + 4*x
-3 + x^2 + 4*x
/ ___\ / ___\ \x + 2 - \/ 7 /*\x + 2 + \/ 7 /
(x + 2 - sqrt(7))*(x + 2 + sqrt(7))
-3.0 + x^2 + 4.0*x
-3 + x*(4 + x)