Factorise $a^{2} - a b - 3 a + 3 b$

(a - b) (a - 3)

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(a - b) (a + 3)

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(a + b) (a - 3)

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(a + b) (a + 3)

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Solution

The correct option is A $(a - b) (a - 3)$
$F a c t o r i z i n g$
$a^{2} - a b - 3 a + 3 b$
$= a (a - b) - 3 (a - b)$
$= (a - b) (a - 3)$

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