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If x = \(\frac{1}{4-\sqrt{15}}\) , y = \(\frac{1}{4+\sqrt{15}}\) , then value of x3 + y3 is1. 486 2. 439 3. 488 4. 476 |
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Answer» 3. 488 x = 4 + √15 y = 4 - √15 x + y = 8 xy = 1 x3 + y3 = (x + y) ((x + y)2 - 3xy) = 8 (64 - 3) = 8 (61) = 488 |
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