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Question
Using suitable identities, evaluate the following.
(9.7)2 – (0.3)2
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Solution
We have,
(9.7)2 – (0.3)2 = (9.7 + 0.3)(9.7 – 0.3) ...[Using the identity, a2 – b2 = (a + b)(a – b)]
= 10 × 9.4
= 94
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