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 June 2nd, 2009, 06:36 AM #1 Newbie   Joined: Mar 2009 Posts: 24 Thanks: 0 Fermat Find a>0 so that $2^x+3^x-a^x=>= 4^x+5^x+a^x$ where x belongs to R. I can't seem to find the extreme point. Any thoughts?

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