Question

Simplify (X + y )(x square minus y square) + (X - y)( X square + y square)

Answer 1

(x + y)(x^2 - y^2)(x - y)(x^2 + y^2)

= (x^2 - y^2)(x^4 - y^4)

= x^6 - x^2y^4 - x^4y^2 + y^6