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If x^(2) + (1)/(x^(2))= 7 and x ne 0, fi...

If `x^(2) + (1)/(x^(2))= 7 and x ne 0`, find the value of : `7x^(3) + 8x- (7)/(x^(3))- (8)/(x)`

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The correct Answer is:
`+-64sqrt(5)`
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