Question

simplyfiy (a+b+c)(a+b-c)​

Answer 1

Step-by-step explanation:

(a+b+c)(a+b−c)

=a

2

+ab−ac+ab+b

2

−bc+ac+bc−c

2

=a

2

+b

2

+c

2

+ab+ab−ac+ac−bc+bc

=

a

2

+b

2

−c

2

+2ab