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    				| 1. | यदि x = 5 और y = 7 तब 49x2 – 70xy + 25y2 का मान ज्ञात कीजिए। | 
| Answer» x = 5 तथा y = 7 49x2 – 70xy + 25y2 = (7x)2 – 2 × 7x × 5y + (5y)2 = (7x – 5y)2 = (7 × 5 – 5 × 7)2 = (35 – 35)2 = 0 | |