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Question
Factorise the following using the identity a2 – b2 = (a + b)(a – b).
9x2 – 1
Sum
Solution
We have,
9x2 – 1 = (3x)2 – 12
= (3x – 1)(3x + 1)
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Chapter 7: Algebraic Expression, Identities and Factorisation - Exercise [Page 235]
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