Find the geometric mean of the two numbers. this iz a hard 1 !!?

Question

4 and 9

4 and 16

3 and 12

5 and 20

4 and 8

6 and 12

Answer 1

First you need to know what this is:

The geometric mean, in mathematics, is a type of mean or average, which indicates the central tendency or typical value of a set of numbers. It is similar to the arithmetic mean, which is what most people think of with the word "average," except that instead of adding the set of numbers and then dividing the sum by the count of numbers in the set, n, the numbers are multiplied and then the nth root of the resulting product is taken.

Check:

http://en.wikipedia.org/wiki/Geometric_m...

So now this isn't hard at all.  If you are working with just two numbers, multiply them and take the square root.  I will do a couple of them for you:

4 and 9

√(4*9) = √36 = 6

4 and 16

√(4*16) = √64 = 8

If you were doing 3 numbers, then you would multiply all three of them and take the 3rd root.

Answer 2

sqrt(4*9) = sqrt(36) = 6

sqrt(4*16) = sqrt(64) = 8

sqrt(3*12) = sqrt(36) = 6

sqrt(5*20) = sqrt(100) = 10

sqrt(4*8) = sqrt(32) = 4*sqrt(2)

sqrt(6*12) = sqrt(72) = 6*sqrt(2)

Answer 3

√(4 * 9) = 6

The rest are the same...