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प्रश्न
Factorise : a2b2 + 8ab - 9
योग
उत्तर
a2b2 + 8ab - 9
= a2b2 + 9ab - ab - 9
= ab( ab + 9 ) -1( ab + 9 )
= ( ab + 9 )( ab - 1 )
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