The geometric mean of two numbers is the square root of their product. To find the geometric mean of 2 and 72, we need to first multiply the two numbers and then take the square root of the product.
The product of 2 and 72 is:
2 x 72 = 144
The square root of 144 is:
√144 = 12
Therefore, the geometric mean of 2 and 72 is 12.