2 6*x - 24
6*x^2 - 1*24
1*(x + 2)*(x - 2)
(1*(x + 2))*(x - 2)
-24.0 + 6.0*x^2
6*(-2 + x)*(2 + x)
/ 2\ 6*\-4 + x /
6*(-4 + x^2)