Question

(a-b) (a^2+b^2+ab) - (a+b) (a^2+b^2-ab)​

Answer 1

a=b

a² = ab

a² -b² = ab -b²

(a+b)(a-b) =b(a-b)

a + b = b

b +b =b

2b =b

2 =1