(x - 12)*(x + 12)
(x - 1*12)*(x + 12)
1*(x + 12)*(x - 12)
(1*(x + 12))*(x - 12)
2 -144 + x
-144 + x^2
(12.0 + x)*(-12.0 + x)
(-12 + x)*(12 + x)