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If x + y = 12 and xy = 27, find the value of x3 + y3 . |
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Answer» x3 + y3 = (x + y) (x2 – xy + y2 ) = (x + y) [(x + y)2 – 3xy] = 12 [122 – 3 × 27] = 12 × 63 = 756 |
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