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प्रश्न
Factorise.
4p2 − 9q2
योग
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उत्तर
4p2 − 9q2
On writing it as follows:
= (2p)2 − (3q)2
Using the identity a2 − b2 = (a − b) (a + b)
= (2p − 3q) (2p + 3q)
= (a − b) (a + b)
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