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Factorisation Using Algebraic Identities

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Question

Question 92 (vi)

Factorise the following using the identity $a^{2} - b^{2} = (a + b) (a - b) .$

$9 x^{2} - 1$

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Solution

$9 x^{2} - 1 = (3 x)^{2} - 1^{2} = (3 x - 1) (3 x + 1)$

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Factorisation Using Algebraic Identities

Standard VIII Mathematics

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