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Old 2007-07-08, 19:50   #6
davieddy
 
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"Lucan"
Dec 2006
England

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Thanks FiveMack.
Actually I tried to prove that 3x^4 +5x^2 +7
was divisible by 15. This could indeed be false,
when x is a multiple of 3 and/or 5.
David

And THX Mally - a successful puzzle :)
Look forward to the next!

Last fiddled with by davieddy on 2007-07-08 at 20:28
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