Question

Simplify : (a+b+c)(a+b-c)​

Answer 1

Explanation:

(a+b+c)(a+b-c)

=a(a+b-c)+b(a+b-c)+c(a+b-c)

=a^2+ab-ac+ab+b^2-bc+ac+bc-c^2

=a^2+b^2-c^2+2ab