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

(a - 2) (b - a)

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(a + 2) (b - a)

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(a + 2) (b + a)

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(a - 2) (b + a)

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Solution

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

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a b - 2 b + a^{2} - 2 a

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