Factorise by grouping method:

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

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Solution

$a b - 2 b + a^{2} - 2 a = b (a - 2) + a (a - 2) = (a - 2) (b + a)$

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

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