2 x - 2*x - 3
x^2 - 2*x - 3
(x + 1)*(x - 3)
2 -3 + x - 2*x
-3 + x^2 - 2*x
-3.0 + x^2 - 2.0*x
-3 + x*(-2 + x)
(1 + x)*(-3 + x)