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Question
Expand the following, using suitable identities.
(7x + 5)2
Sum
Solution
We have,
(7x + 5)2 = (7x)2 + 52 + 2 × 7x × 5 ...[Using the identity, (a + b)2 = a2 + b2 + 2ab]
= 49x2 + 25 + 70x
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Chapter 7: Algebraic Expression, Identities and Factorisation - Exercise [Page 232]
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