Additional Resources

Mean Value Theorem


Objectives

  • Explain the meaning of Rolle’s theorem.
  • Describe the significance of the Mean Value Theorem.
  • State three important consequences of the Mean Value Theorem.

Summary

  • If f ′(x) = 0 over an interval I, then f is constant over I.
  • If two differentiable functions f and g satisfy f ′(x) = g′(x) over I, then f(x) = g(x) + C for some constant C.
  • If f ′(x) > 0 over an interval I, then f is increasing over I. If f ′(x) < 0 over I, then f is decreasing over I. 

Rolle’s theorem

  • If f is continuous over [a, b] and differentiable over (a, b) and f(a) = 0 = f(b), then there exists a point
    c ∈ (a, b) such that f ′(c) = 0.

Mean Value Theorem

  • If f is continuous over [a, b] and differentiable over (a, b), then there exists a point c ∈ (a, b) such that

f ( c ) = f ( b ) f ( a ) b-a