Question

Square root of 15 is the geometric mean of x and y . find y if x=3?

Answer 1

`y=5`

Explanation:

if `sqrt15` is the geometric mean of `x` and `y`, the formula is as follows:

`sqrt15/y=x/sqrt15`

Cross multiply; `sqrt15*sqrt15=xy`

Since `x=3`, `15=3y`

`y=5`