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यदि x = (5 - √21)/2, तो सिद्ध कीजिये (x^3 - 1/x^3) - 5(x^2 + 1/x^2) + (x + 1/x)  = -2(12√21 + 55)

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यदि x = (5 - √21)/2, तो सिद्ध कीजिये (x3 - 1/x3) - 5(x2 + 1/x2) + (x + 1/x)

 = -2(12√21 + 55)

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x = (5 - √21)/2

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