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प्रश्न
Find the square of : 3a - 4b
बेरीज
उत्तर
We know that
( a - b )2 = a2 + b2 - 2ab
( 3a - 4b )2 = 9a2 + 16b2 - 2 x 3a x 4b
= 9a2 + 16b2 - 24ab
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