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प्रश्न
Evaluate : (9a − 7b) (3a − b)
योग
उत्तर
(9a − 7b) (3a − b)
= 9a (3a − b) − 7b (3a − b)
= 27a2 − 9ab − 21ab + 7b2
= 27a2 − 30ab + 7b2
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Product of Sum and Difference of Two Terms
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