Posted by saud on Sunday, November 6, 2011 at 1:09am.
f(1)=1/1=1
f(9)=1/9
The mean slope is ((1/9)-1)/(9-1)= -1/9
Now calculate f'(x)=-1/x²
So we need to solve for
f'(x)=-1/9
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.
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