Here's the problem: Sq root(ab) ≤ (a+b)/2

So I'm stuck here, how do I prove that a and b are positive real numbers? Should I go with a counterexample?

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- October 23rd 2012, 09:21 PMbxuanCan anyone help me prove this equation?
Here's the problem: Sq root(ab) ≤ (a+b)/2

So I'm stuck here, how do I prove that a and b are positive real numbers? Should I go with a counterexample? - October 23rd 2012, 10:23 PMJJacquelinRe: Can anyone help me prove this equation?
a= -1

b= -1

sqrt(ab)=sqrt(1)=1

(a+b)/2 = (-1-1)/2 = -1

sqrt(ab)>(a+b)/2 - October 24th 2012, 02:31 AMPlatoRe: Can anyone help me prove this equation?