posted by saud .
Find a point c satisfying the conclusion of the Mean Value Theorem for the following function and interval.
The mean slope is ((1/9)-1)/(9-1)= -1/9
Now calculate f'(x)=-1/x²
So we need to solve for
which gives x=3 or -3.
Since only x=3 is on the interval [1,9], this is the only solution, i.e. c=3.