Factorise : $3 a^{2} b - 12 a^{2} - 9 b + 36$

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Solution

$3 a^{2} b - 12 a^{2} - 9 b + 36 = 3 a^{2} (b - 4) - 9 (b - 4) (By grouping) = (b - 4) (3 a^{2} - 9) = (b - 4) 3 (a^{2} - 3) = 3 (b - 4) (a^{2} - 3)$

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