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Question
Evaluate : (a+1) (a-1) (a2+1)
Sum
Solution
(a+1) (a-1) (a2+1)
= [(a)2−(1)2] (a2+1)
= (a2−1) (a2+1)
= (a2)2 − (1)2
= a4 − 1
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Product of Sum and Difference of Two Terms
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