Question

simplify (a+b+c) (a+b-c) ​

Answer 1

Answer:

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Answer 2

Step-by-step explanation:

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

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

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

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

=a2+ab-ac+ab+b2-bc+ac+bc-c2

=a2+b2-c2+ab+ab-bc+bc-ac+ac

=a2+b2-c2+2ab.