Question

Cat face (a-b-c) la puterea2

Answer 1

a la 2 + b la 2+ c la 2-2ab-2ac-2bc

Answer 2

$(a-b-c)^{2}$=(a-b-c)×(a-b-c)=a²-ab-ac-ba-b²+bc-ac+bc+c²
= a²+b²+c²+2bc-2ac-2ba