prouve :http://www.mathramz.com/xyz/latexren...d0d142b283.png (Headbang)

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- June 7th 2009, 06:48 AMdhiabNumber in Q
**prouve :**http://www.mathramz.com/xyz/latexren...d0d142b283.png (Headbang) - June 7th 2009, 08:27 AMrunning-gag

Hi

If you consider the equation you can find that x=1 is the only real solution since

Now if you try to solve it using Cardan method Méthode de Cardan - Wikipédia you will find that one real solution is

Since 1 is the only real solution you get