2 x - 2*x - 5
x^2 - 2*x - 5
2 -5 + x - 2*x
-5 + x^2 - 2*x
/ ___\ / ___\ \x + -1 + \/ 6 /*\x + -1 - \/ 6 /
(x - 1 + sqrt(6))*(x - 1 - sqrt(6))
-5.0 + x^2 - 2.0*x
-5 + x*(-2 + x)