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Topic: a real pearl!
Replies: 7   Last Post: Jul 3, 2009 8:46 AM

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Afonso Henriques Silva Leite

Posts: 1
From: Brazil
Registered: 4/20/09
a real pearl!
Posted: Apr 20, 2009 6:21 PM
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I am trying to prove that the number $x = (2-\sqrt{5})^{1/3}+(2+\sqrt{5})^{1/3}$ is irrational, but i just can't eliminate the roots!!!
Does anyone has any idea???



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