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प्रश्न
Multiply: 5a − 1 by 7a − 3
बेरीज
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उत्तर
(5a − 1)(7a − 3)
= 5a (7a − 3) − 1 (7a − 3)
= 35a2 − 15a − 7a + 3
= 35a2 − 22a + 3
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