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प्रश्न
Evaluate : (7x + 15y) (5x − 4y)
बेरीज
उत्तर
(7x + 15y) (5x − 4y)
= 7x (5x − 4y) + 15y (5x − 4y)
= 35x2 − 28xy + 75xy − 60y2
= 35x2 + 47xy − 60y2
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Product of Sum and Difference of Two Terms
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