a^3+a^2-ab^2-b^2 = a^2 (a+1) -b^2 (a+1) = (a^2-b^2) (a+1)= (a-b) (a+b) (a+1)
9n+m^3-m^2n - 9m = 9(n-m) -m^2(n-m) =(n-m) (9-m^2)=(n-m) (3-m) (3+m)
a^3+a^2-ab^2-b^2 = a^2 (a+1) -b^2 (a+1) = (a^2-b^2) (a+1)= (a-b) (a+b) (a+1)
9n+m^3-m^2n - 9m = 9(n-m) -m^2(n-m) =(n-m) (9-m^2)=(n-m) (3-m) (3+m)