Factorise by the grouping method : a (a -4) - a + 4 - Vidyadip

Question

Factorise by the grouping method :$ a (a -4) - a + 4$

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Answer

$a (a -4) - a + 4$
$= a( a - 4 ) -1( a - 4 )$
$= ( a - 4 )( a - 1 )$

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