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Question
Evaluate: (a2 + 5) (a2 − 3)
Sum
Solution
(a2 + 5) (a2 − 3) = a2 (a2 − 3) + 5 (a2 − 3)
= a4 − 3a2 + 5a2 − 15
= a4 + 2a2 − 15
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Product of Sum and Difference of Two Terms
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