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प्रश्न
Find the square of : 3a + 7b
उत्तर
We know that
( a + b )2 = a2 + b2 + 2ab
( 3a + 7b )2 = 9a2 + 49b2 + 2 x 3a x 7b
= 9a2 + 49b2 + 42ab
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