Question
Factorise by the grouping method $: a^2+ b -ab- a$
✓
Answer
$a^2 + b - ab - a$
$= a2 - a + b - ab$
$= a( a - 1) + b( 1 - a )$
$= a(a - 1) - b(a - 1)$
$= (a -1)(a - b)$
$= a2 - a + b - ab$
$= a( a - 1) + b( 1 - a )$
$= a(a - 1) - b(a - 1)$
$= (a -1)(a - b)$
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