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प्रश्न
Using suitable identities, evaluate the following.
(49)2
योग
उत्तर
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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अध्याय 7: Algebraic Expression, Identities and Factorisation - Exercise [पृष्ठ २३३]
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