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Mean Value Theorem : Roots of Derivatives on an Interval

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The function f (x) and all of its derivatives are continuous on [0, 10]. You know that f (0) = 0,
f (2) = 0, f (3) = 0, f (6) = 0, and f (8) = 0. At how many points must the first derivative of f (x)
be zero? At how many points must the second derivative of f (x) be zero? At how many points must the third derivative of f (x) be zero? And so on. Justify your answers.

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Solution Summary

Mean value theorem and roots of derivatives on an interval are investigated. The solution is detailed and well presented.

Solution Preview

We can use the mean value theorem.
f(0)=0, f(2)=0, f(3)=0, f(6)=0, f(8)=0
Then
1. For the first derivative, we can find x1 in (0,2), such that f'(x1)=0; we can find x2 in (2,3), such that f'(x2)=0;
we can find x3 in (3,6), such that f'(x3)=0; we can find ...

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