expand (a+b+c)(a+b-c) using suitable identities
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Step-by-step explanation:
(a+b+c)(a+b-c)
=a×a+a×b-a×c+a×b+b×b-b×c+c×a+c×b-c×c
=a^2+ab-ac+ab+b^2-bc+ac+bc-c^2
=a^2+2ab+b^2-c^2
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