2 x - 2*x - 24
x^2 - 2*x - 24
2 -24 + x - 2*x
-24 + x^2 - 2*x
(x + 4)*(x - 6)
-24.0 + x^2 - 2.0*x
(-6 + x)*(4 + x)
-24 + x*(-2 + x)