(a-b-c) (a-b+c) equals to what
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=a^2-ab+ac-ab+b^2-bc-ac+bc-c^2
=a^2+b^2-c^2-2ab
=a^2+b^2-c^2-2ab
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Answered by
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its A+B+C=10
you need 1+2+3=10
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