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प्रश्न
Multiply: 12a + 5b by 7a − b
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उत्तर
(12a + 5b) (7a − b) = 12a (7a − b) + 5b (7a − b)
= 84a2 − 12ab + 35ab − 5b2
= 84a2 + 23ab − 5b2
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