Factorise:
$4 (a + b) - 6 (a + b)^{2}$

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Solution

$4 (a + b) - 6 (a + b)^{2}$

= (a + b) [4 – 6 (a + b)]

= 2 (a + b) (2 – 3a – 3b)

= 2 (a + b) (2 – 3a – 3b)

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