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प्रश्न
Use the direct method to evaluate :
(3b−1) (3b+1)
बेरीज
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उत्तर
Note: (a+b) (a−b) = a2 − b2
(3b−1) (3b+1)
= (3b)2 − (1)2
= 9b2 − 1
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