Question

What is the geometric mean of 7 and 12?
A.) 1 5/7
B.) 9.5
C.) 2√21
D.) 4√21

Answer 1

We know that geometric mean of $a$ and $b$ is $\sqrt{ab}$

The geometric mean of 7 and 12 is:

$$\text{the geometric mean} = \sqrt{7 * 12} = \sqrt{84} = 2\sqrt{21}$$