Question

3. If the geometric mean of a and 25 is 20,
find the value of a.

Answer 1

Value of a is 16.

Explanation:

Solution Given:

we know that

Geometric mean=
`√(a*b)`

By using this formula

20=
`√(a*25)`

20=5
`√(a)`

dividing both side by 5, we get

20/5=5/5*
`√(a)`

4=
`√(a)`

squaring both side

4²=a

:. a=16