Saturday
November 22, 2014

Homework Help: math

Posted by Meg on Thursday, February 3, 2011 at 9:20pm.

Prove that if x and y are nonnegative real numbers, then (x+y)/2 ≥ sqrt(xy).

Use the technique of working backward from the desired conclusion. Where in the proof do we use the fact that x and y are nonnegative?

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