2 x + 4*x + 1
x^2 + 4*x + 1
2 1 + x + 4*x
1 + x^2 + 4*x
/ ___\ / ___\ \x + 2 + \/ 3 /*\x + 2 - \/ 3 /
(x + 2 + sqrt(3))*(x + 2 - sqrt(3))
1 + x*(4 + x)
1.0 + x^2 + 4.0*x