Describe the significance of the Mean Value Theorem.
State three important consequences of the Mean Value Theorem.
The
Mean Value Theorem is one of the most important theorems in calculus. We look at some of its implications at the end of this section. First, let’s start with a special case of the Mean Value Theorem, called Rolle’s theorem.
Rolle’s theorem
Informally,
Rolle’s theorem states that if the outputs of a differentiable function
are equal at the endpoints of an interval, then there must be an interior point
where
[link] illustrates this theorem.
Rolle’s theorem
Let
be a continuous function over the closed interval
and differentiable over the open interval
such that
There then exists at least one
such that
Proof
Let
We consider three cases:
for all
There exists
such that
There exists
such that
Case 1: If
for all
then
for all
Case 2: Since
is a continuous function over the closed, bounded interval
by the extreme value theorem, it has an absolute maximum. Also, since there is a point
such that
the absolute maximum is greater than
Therefore, the absolute maximum does not occur at either endpoint. As a result, the absolute maximum must occur at an interior point
Because
has a maximum at an interior point
and
is differentiable at
by Fermat’s theorem,
Case 3: The case when there exists a point
such that
is analogous to case 2, with maximum replaced by minimum.
□
An important point about Rolle’s theorem is that the differentiability of the function
is critical. If
is not differentiable, even at a single point, the result may not hold. For example, the function
is continuous over
and
but
for any
as shown in the following figure.
Let’s now consider functions that satisfy the conditions of Rolle’s theorem and calculate explicitly the points
where
Using rolle’s theorem
For each of the following functions, verify that the function satisfies the criteria stated in Rolle’s theorem and find all values
in the given interval where
over
over
Since
is a polynomial, it is continuous and differentiable everywhere. In addition,
Therefore,
satisfies the criteria of Rolle’s theorem. We conclude that there exists at least one value
such that
Since
we see that
implies
as shown in the following graph.
As in part a.
is a polynomial and therefore is continuous and differentiable everywhere. Also,
That said,
satisfies the criteria of Rolle’s theorem. Differentiating, we find that
Therefore,
when
Both points are in the interval
and, therefore, both points satisfy the conclusion of Rolle’s theorem as shown in the following graph.
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