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4.2 - The Mean Value Theorem. Theorems If the conditions (hypotheses) of a theorem are satisfied, the conclusion is known to be true. If the hypotheses of a theorem are not satisfied, the conclusion may still be true, but not guaranteed. Rolle’s Theorem.

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4 2 the mean value theorem

4.2 - The Mean Value Theorem

TheoremsIf the conditions (hypotheses) of a theorem are satisfied, the conclusion is known to be true. If the hypotheses of a theorem are not satisfied, the conclusion may still be true, but not guaranteed.

rolle s theorem
Rolle’s Theorem
  • Let f be a function that satisfies the following three hypotheses:
  • f is continuous on the closed interval [a, b].
  • f is differentiable on the open interval (a, b).
  • f (a) = f (b)
  • Then there is a number c in (a, b) such that
  • f′(c) = 0.
examples rolle s theorem
Examples: Rolle’s Theorem
  • Explain why the conclusion to Rolle’s Theorem is not guaranteed for the function
  • f (x) = x / (x – 3) on the interval [1, 6].

2. Verify that the function satisfies the three hypotheses of Rolle’s Theorem on the given interval. Then find all numbers c that satisfy the conclusion of Rolle’s Theorem.

the mean value theorem
The Mean Value Theorem
  • Let f be a function that satisfies the following two hypotheses:
  • f is continuous on the closed interval [a, b].
  • f is differentiable on the open interval (a, b).
  • Then there is a number c in (a, b) such that
example mean value theorem
Example: Mean Value Theorem

3. Verify that the function satisfies the two hypotheses of Mean Value Theorem on the given interval. Then find all numbers c that satisfy the conclusion of Mean Value Theorem.

theorem
Theorem

If f ′(x) = 0 for all x in an interval (a, b), then f is constant on (a, b).

Corollary If f ′(x) = g′(x) for all x in an interval (a, b), then f – g is constant on (a, b); that is,

f(x) = g(x) + c where c is a constant.

Example: If f (x) = x2 + 3 and g(x) = x2 + 7, find f ′(x), g ′(x), and (f – g)(x).

proof by contradiction
Proof By Contradiction
  • Assume that something is true.
  • Show that under your assumptions, the conditions of a known theorem are satisfied. This guarantees the conclusion of that theorem.
  • Show that the conclusion of the theorem is, in fact, not true under the assumptions.
  • Since the conclusion of the theorem must be true if the assumptions were satisfied, the only conclusion left is that the assumptions must be incorrect.
example
Example

Show that the equation 2x – 1 – sin x = 0 has exactly one real root.