Factorise :

$12 x^{2} - 27$

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Solution

$12 x^{2} - 27 = 3 (4 x^{2} - 9) = 3 {(2 x)^{2} - (3)^{2}} = 3 (2 x + 3) (2 x - 3) A n s .$

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