What is the geometric mean of 9 and 18

Kappers asked Mar 9, 2023

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Kappers asked Mar 9, 2023

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24 votes

$\cfrac{9}{x}~~ = ~~\cfrac{x}{18}\implies 162=x^2\implies √(162)=x\implies √(9^2\cdot 2)=x\implies 9√(2)=x$

George Chen answered Mar 15, 2023

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