Question

Desenvolver (A+B+C)^2

Answer 1

(A+B+C)^2 =

A² + AB + AC + BA + B² + BC + CA + CB+ C² = A² + B² + C² + 2AB + 2AC +2BC

Answer 2

$(A+B+C)^2=A^2+2 A B+2 A C+B^2+2 B C+C^2$