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    				| 1. | यदि 4x2 + y2 = 40 व xy =6, तब सिद्ध कीजिए कि 2x + y = ± 8 | 
| Answer» 4x2 + y2 = 40 ⇒ (2x)2 + (y)2 + 2(2x)(y) = 40 + 2(2x)(y) ⇒ (2x + y)2 = 40 + 4(6) = 40 + 24 ⇒ (2x + y)2 = 64 ⇒ (2x + y) = ± 8 | |