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प्रश्न
Evaluate using the expansion of (a + b)2 or (a – b)2 :
(415)2
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उत्तर
(415)2 = (400 + 15)2
= (400)2 + (15)2 + 2(400)(15)
= 160000 + 225 + 12000
= 172225
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