2 x + 4*x - 1
x^2 + 4*x - 1
/ ___\ / ___\ \x + 2 - \/ 5 /*\x + 2 + \/ 5 /
(x + 2 - sqrt(5))*(x + 2 + sqrt(5))
2 -1 + x + 4*x
-1 + x^2 + 4*x
-1.0 + x^2 + 4.0*x
-1 + x*(4 + x)