$\left ( 3+\sqrt{5} \right )^{x}+16.\left ( 3-\sqrt{5} \right )^{x}=2^{x+3}$
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Edited by E. Galois, 19-11-2012 - 21:19.
Edited by E. Galois, 19-11-2012 - 21:19.
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