Question

factorise 81x² - 18 y² using algebraic identities ​

Answer 1

Step-by-step explanation:

$81 {x}^{2} - 18 {y}^{2} \\ {(9x)}^{2} - {(3 \sqrt{2} y)}^{2} \\ using \: identity \\ {x}^{2} - {y }^{2} = (x + y)(x - y) \\ (9x + 3 \sqrt{2} )(9x - 3 \sqrt{2} )$

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