Question

Simplify: (a + b +c)(a + b – c)​

Answer 1

Step-by-step explanation:

a²+b²-c²+2ab

(a+b+c)(a+b−c)

=a²+ab−ac+ab+b²−bc+ac+bc−c²

ab and bc are cancelled by −ab and −bc

=a² +b² −c² +2ab

Hope this helps you

Answer 2

Answer:

a2 + b2 - c2 + 2ab

Step-by-step explanation:

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

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

= a2 + ab - ac + ba + b2 - bc + ca + cb -c2

= a2 + b2 - c2 + (1+1)ab (-1+1)ca (-1+1)bc

= a2 + b2 - c2 + 2ab

Hope it helps...