(a+b-c)(a-b-c) multiply
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(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 -b^2 +c^2 -2ac
ANS:- a^2 -b^2 +c^2 -2ac
=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 -b^2 +c^2 -2ac
ANS:- a^2 -b^2 +c^2 -2ac
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