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प्रश्न
Expand : (2a + b)2
योग
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उत्तर
(2a + b)2 = (2a)2 + (b)2 + 2 × 2a × b ......[(a+b)2 = a2 + b2 + 2ab]
= 4a2 + b2 + 4ab
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