What should be added to 4c(-a+b+c)(a-b-c) to get 3a(a+b+c)-3b(a-b-c)??
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Answer:
the answer is 3a
2
+ab+7ac−6bc+2b
2
−4c
2
should be added to 4c (-a+b+c) to obtain 3a(a+b+c) -2b(a-b+c)
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