Factorise the following using the identity a2 – b2 = (a + b)(a – b). 9x2 – 1 - Mathematics

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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Expansion of (a + b)(a - b) = a2-b2

Is there an error in this question or solution?

Q 92. (vi)Q 92. (v)Q 92. (vii)

Chapter 7: Algebraic Expression, Identities and Factorisation - Exercise [Page 235]

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NCERT Exemplar Mathematics [English] Class 8

Chapter 7 Algebraic Expression, Identities and Factorisation
Exercise | Q 92. (vi) | Page 235

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Factorise the following using the identity a2 – b2 = (a + b)(a – b). 9x2 – 1 - Mathematics

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Factorise the following using the identity a2 – b2 = (a + b)(a – b). 9x2 – 1 - Mathematics

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