2 x - 5*x - 5
x^2 - 5*x - 5
/ ___\ / ___\ | 5 3*\/ 5 | | 5 3*\/ 5 | |x + - - + -------|*|x + - - - -------| \ 2 2 / \ 2 2 /
(x - 5/2 + 3*sqrt(5)/2)*(x - 5/2 - 3*sqrt(5)/2)
2 -5 + x - 5*x
-5 + x^2 - 5*x
-5.0 + x^2 - 5.0*x
-5 + x*(-5 + x)