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Question
Find the value of a, if 9a = 762 – 672
Solution
We have,
9a = 762 – 672
⇒ 9a = (76 + 67)(76 – 67) ...[Using the identity, a2 – b2 = (a + b)(a – b)]
⇒ 9a = 143 × 9
⇒ `a = (143 xx 9)/9`
⇒ a = 143
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