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Question
Using suitable identities, evaluate the following.
(49)2
Evaluate
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Solution
We have,
(49)2 = (50 – 1)2
= (50)2 + 12 – 2 × 50 × 1 ...[Using the identity, (a – b)2 = a2 + b2 – 2ab]
= 2500 + 1 – 100
= 2401
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Chapter 7: Algebraic Expression, Identities and Factorisation - Exercise [Page 233]
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