8
(m + n + p)^2
= (m + n + p) (m + n + p);
= m^2 + mn + mp + mn + n^2 + np + mp + np + p^2;
= m^2 + 2mn + 2mp + n^2 + 2np + p^2
Added 8/18/2014 6:31:44 AM
This answer has been confirmed as correct and helpful.
Confirmed by
jeifunk [8/18/2014 6:43:41 AM]