Question

The Geometric mean of two
numbers √82-1 and √82 + 1 is​

Answer 1

Geometic Mean : $\sqrt{ab}$

ab means multiplication of two numbers, and takes square root over it.

Multiplication of two number uses identity because multiplication is simple.

$(\sqrt{82} -1)(\sqrt{82} +1)=82-1=9^2$

Now square root over 9² is 9

Therefore, geometric mean of two number is 9