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