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by Math Tutor » Tue Mar 09, 2010 8:04 am
Find all
[tex]n \in N[/tex]
so that
[tex]n^7 + 7 = a^2, a \in N[/tex]
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by Danh » Mon Jun 07, 2010 11:09 pm
no exist n and a because a2>0 -> n7-a2=-7-> n7<0->n<0. but [tex]n \in N[/tex] ->n≥0.
Is that right?
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Danh
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by Math Tutor » Tue Jun 08, 2010 11:43 am
n7-a2=-7-> n7<0 - this is not right
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