add: a2 + ba - bc + c2 + 2cb-5ca + b2 + ac - 2ab
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add: a2 + ba - bc + c2 + 2cb-5ca + b2 + ac - 2ab
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Answer:
a2 + ba - bc + c2 + 2cb - 5ca + b2 + ac - 2ab
= a2 + b2 + c2 - 2ab + ba + 2cb - bc - 5ca + ac
= a2 + b2 + c2 - ab + bc - 4ac
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