8
(x+y) (x+2y) (x-y)
= (x^2 + 2xy + xy + 2y^2)(x - y);
= (x^2 + 3xy + 2y^2)(x - y);
= x^3 - x^2y + 3x^2y - 3xy^2 + 2xy^2 - 2y^3;
= x^3 + 2x^2y - xy^2 - 2y^3
Added 6/3/2015 12:17:16 AM
This answer has been confirmed as correct and helpful.
Confirmed by
Andrew. [6/3/2015 12:18:29 AM]
