(a+b)(a-b)=a^2-b^2 (The Real Proof) Oct 4, 2017 7:35:33 GMT Quote Select PostDeselect PostLink to PostMemberGive GiftBack to Top Post by Tiago on Oct 4, 2017 7:35:33 GMT (a+b)(a-b)=a^2-b^2 (The Real Proof)