(a+b+c)(d-e-f) - Proof & Expansion - A Level Maths Oct 4, 2017 7:36:10 GMT Quote Select PostDeselect PostLink to PostMemberGive GiftBack to Top Post by Tiago on Oct 4, 2017 7:36:10 GMT (a+b+c)(d-e-f) - Proof & Expansion - A Level Maths