simplify (a+b+c) (a+b-c)
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Answer: 2ab is the answer
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Step-by-step explanation:
a(a+b+c) + b(a +b-c) +c(a+b-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.
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