Homework Help: geometry

Posted by Terri on Monday, February 23, 2009 at 5:36pm.

Find the geometric mean between 7 and 21

I do not have a clue where to start the equation given was
extreme/extreme=mean/extreme
so (mean)(mean)=(extreme)(extreme)

help please

geometry - Reiny, Monday, February 23, 2009 at 5:57pm
let the geometric mean be x
then x/7 = 21/x
x^2 = 147
x = ą √147

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