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Homework Statement
Given the function f(x)= x(x^2-8)-5 satisfies the hypothesis of the Mean Value Thereom on the interval [1,4], find a number C in the interval (1,4) which satisfies this thereom.
Homework Equations
f'(c) = f(b)-f(a) / b-a
The Attempt at a Solution
1) Expand the equation first
2) Find the first derivative.
3) Equal the equation to 1
Apparently, I got the wrong answer. What am I doing wrong?
PLEASE HELP.