Factorise by the grouping method : ab- 2b + a^2- 2a - Vidyadip

Question

Factorise by the grouping method : $ab- 2b + a^2- 2a$

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Answer

$ab- 2b + a^2 - 2a$
$= b( a - 2 ) + a( a - 2 )$
$= ( a + b )( a - 2 )$

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