(a-b-c)(a+b+c)=please give answer of my question
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Answer:a^2-b^2-c^2-2bc
Step-by-step 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+ab-ab+ac-ac-b^2-bc-bc-c^2
a^2-b^2-c^2-2bc
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