Question
Factorise: $ab^2+ (a - 1)b - 1$
✓
Answer
$= ab^2+ ab - b - 1$
$= ab(b + 1) - 1(b + 1)$
$= (b + 1)(ab - 1)$
$= ab(b + 1) - 1(b + 1)$
$= (b + 1)(ab - 1)$
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