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Question
Find the sum of: a2 + b2 + 2ab, 2b2 + c2 + 2bc and 4c2 -a2 + 2ac
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Solution
a2 + b2 + 2ab, 2b2 + c2 + 2bc and 4c2 -a2 + 2ac
a2 + b2 + 2ab + 2b2 + c2 + 2bc + 4c2 -a2 + 2ac
= a2 - a2 + b2 + 2b2 + c2 + 4c2 + 2ab + 2bc + 2ac
= 3b2 + 5c2 + 2ab + 2bc + 2ac
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