Whats the geometric mean of 9 and 16

Answer 1

For x to be the geometric mean between 9 and 16 it must satisfy

9 : x :: x : 16

x² = 144

x = ±12

Answer 2

The geometric mean is another way of estimating a list of numbers. You get it by taking the nth root of the product of n numbers.

For example, to get the geometric mean of 10, 11, and 12, we do

³√(10 * 11 * 12) = 10.97. We use the cube root here since there are three numbers.