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प्रश्न
Find the product.
(x + 7y) (7x − y)
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उत्तर
(x + 7y) (7x − y)
= x (7x − y) + 7y (7x − y)
= 7x2 − xy + 49xy − 7y2
= 7x2 + 48xy − 7y2
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