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प्रश्न
Factorise.
9x2y2 − 16
योग
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उत्तर
9x2y2 − 16
On writing it as follows:
= (3xy)2 − (4)2
Using the identity a2 − b2 = (a − b) (a + b)
= (3xy − 4) (3xy + 4)
= [a2 − b2 = (a − b) (a + b)]
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