(x - 10)*(x + 10)
(x - 1*10)*(x + 10)
2 -100 + x
-100 + x^2
1*(x + 10)*(x - 10)
(1*(x + 10))*(x - 10)
(10.0 + x)*(-10.0 + x)
(-10 + x)*(10 + x)