If a, b and c are positive real numbers, prove that 4(a³ + b³) ≥ (a + b)³ & that 9(a³ + b³ + c³) ≥ (a + b + c)³
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Originally Posted by Mozart If a, b and c are positive real numbers, prove that 4(a³ + b³) ≥ (a + b)³ & that 9(a³ + b³ + c³) ≥ (a + b + c)³ for the first one;
Last edited by bram kierkels; October 2nd 2009 at 02:46 AM.
that's wrong proof. to fix it, in each step you need to add an
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