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 + x*(-4 + x)
-3.0 + x^2 - 4.0*x