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geometry

posted by on .

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 - ,

    let the geometric mean be x
    then x/7 = 21/x
    x^2 = 147
    x = ± √147

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