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Question
Evaluate: (4x2 − 5y2) (4x2 + 5y2)
Sum
Solution
(4x2 − 5y2) (4x2 + 5y2)
= (4x)2 − (5y2)2
= 16x4 − 25y4 ......[ ∵ (a − b) (a + b) = a2 − b2]
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Product of Sum and Difference of Two Terms
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