2 36*x - 144
36*x^2 - 1*144
1*(x + 2)*(x - 2)
(1*(x + 2))*(x - 2)
/ 2\ 36*\-4 + x /
36*(-4 + x^2)
-144.0 + 36.0*x^2
36*(-2 + x)*(2 + x)