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Question
Subtract the second expression from the first:
a2 + ab + c2, a2 - d2
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Solution
(a2 + ab + c2) - (a2 - d2 )
= a2 + ab + c2 - a2 + d2
= a2 - a2 + ab + c2 + d2
= ab + c2 + d2
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