3.2 Rolle’s Theorem and the Mean Value Theorem

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Presentation transcript:

3.2 Rolle’s Theorem and the Mean Value Theorem

Rolle’s Theorem Let f be continuous on the closed interval [a,b] and differentiable on the open interval (a,b). If f (a) = f (b) then there is at least on number c in (a, b) such that f ‘(c)=0

Example 1

Example 2

The Mean Value Theorem If f is continuous on the closed interval [a,b] and differentiable on the open interval (a,b), then there exists a number c in (a,b) such that

Some thoughts…. The MVT is most often used to prove other theorems It guarantees the existence of a tangent line which is parallel to the secant line through the points (a, f (a)) and (b, f (b)) i.e., there must exist a point c in (a, b) at which the instantaneous rate of change is equal to the average rate of change over the interval [a,b]

Example 3

Example 4 Two stationary patrol cars equipped with radar are 5 mi apart on a highway. As a truck passes the first patrol car, its speed is clocked at 55 mph. Four minutes later, the second patrol car clocks the truck at 50 mph. Prove that the truck must have exceeded the speed limit of 55 mph at some point during that 4 minutes.