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Question
Using suitable identities, evaluate the following.
(9.9)2
Sum
Solution
We have,
(9.9)2 = (10 – 0.1)2
= 102 + (0.1)2 – 2 × 10 × 0.1 ...[Using the identity, (a – b)2 = a2 + b2 – 2ab]
= 100 + 0.01 – 2
= 98.01
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Chapter 7: Algebraic Expression, Identities and Factorisation - Exercise [Page 233]
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