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

Question

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

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Answer

$y^2 - (a + b) y + ab$
$= y2 - ay - by + ab$
$= y( y - a ) - b( y - a )$
$= ( y - a )( y - b )$

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