What is the geometric mean of 81 and 4?

3 Answers
Feb 20, 2018

"The GM of "81 and 4," by definition, is "sqrt(81xx4)=18.

Feb 20, 2018

sqrt(81*4) = 9*2 = 18

Explanation:

Geometric mean of a and b = Square root of (a x b)

Feb 20, 2018

see a solution process below;

Explanation:

We can say let those two digits be represented by x and z

Hence;

x = 81

z = 4

Geometric Mean = y

Recall;

Geometric Mean rArr y =sqrt(xz)

y = sqrt(xz)

Substituting the values..

y = sqrt(81 xx 4)

y = sqrt324

y = 18

Hence the Geometric Mean of 81 and 14 is 18.

Hope this helps!