Question

$if \: x = \frac{5 - \sqrt{21} }{2} \: prove \: that$
$( {x}^{3} + \frac{1}{ {x}^{3} }) - 5( {x}^{2} + \frac{1}{ {x}^{2} } ) + (x + \frac{1}{x} = 0$
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Answer 1

Answer:

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