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f(x) = ln x, [1, 8] Using mean value theorem, find all numbers c that satisfy the conclusion of the Mean Value Theorem.

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I found my c to be 3.366 but the answer is wrong
a=1 and b=8

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Other answers:

yes, i know how to do it..but got it wrong.. don't know why
Does it want an approximation?
it didn't i'm thinking should the answer be an exact number
(Enter your answers as a comma-separated list. If it does not satisfy the hypotheses, enter DNE).
but then i think there is only 1 number c
Well the number you put above is not the exact answer
That is call an appoximation
how do get an exact number?
So I assume you did the setup right because you got the approximation to the correct answer
This is the setup you chose? \[\frac{1}{c}=\frac{\ln(8)-\ln(1)}{8-1}\]
We know ln(1) =? and 8-1=? So can you tell me what 1/c= Don't use your calculator
and then f'(c) = 1/c then solve for c
ln 1 = 0 8-1= 7
Ok we have \[\frac{1}{c}=\frac{\ln(8)-0}{7}\] Do you know how to solve this for c?
ln 8/ 7 = 1/c c= 7/ln8
ok thanks so much!

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