Question
Factorise$ : a^2b^2+ 8ab - 9$
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Answer
$a^2b^2 + 8ab - 9$
$= a^2b^2 + 9ab - ab - 9$
$= ab( ab + 9 ) -1( ab + 9 )$
$= ( ab + 9 )( ab - 1 )$
$= a^2b^2 + 9ab - ab - 9$
$= ab( ab + 9 ) -1( ab + 9 )$
$= ( ab + 9 )( ab - 1 )$
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