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प्रश्न
Factorise the following using the identity a2 – b2 = (a + b)(a – b).
9x2 – 1
बेरीज
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उत्तर
We have,
9x2 – 1 = (3x)2 – 12
= (3x – 1)(3x + 1)
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पाठ 7: Algebraic Expression, Identities and Factorisation - Exercise [पृष्ठ २३५]
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