## Rolle’s Theorem

### Rolle’s Theorem is a fundamental result in calculus named after Michel Rolle

Rolle’s Theorem is a fundamental result in calculus named after Michel Rolle. It states that if a function f(x) is continuous on a closed interval [a, b], differentiable on the open interval (a, b), and f(a) = f(b), then there exists at least one point c in the open interval (a, b) such that f'(c) = 0.

In simpler terms, Rolle’s Theorem states that if a function starts and ends at the same y-value (f(a) = f(b)), then there must be at least one point within the interval (a, b) where the derivative of the function is equal to zero (f'(c) = 0).

To understand the significance of Rolle’s Theorem, let’s consider an example. Suppose you have a car that starts and ends at the same position after some time. This means that at some point during the journey, the car must have been stationary (velocity = 0). This concept is analogous to Rolle’s Theorem, where the car’s position is represented by the function and its velocity is represented by the derivative.

Rolle’s Theorem is essential in calculus because it guarantees the existence of critical points in a specific scenario. These critical points have a derivative of zero and can be used to find extrema (maximum or minimum), inflection points, and other important characteristics of a function.

It’s worth noting that the hypothesis of Rolle’s Theorem must be satisfied for the theorem to apply. If the function is not continuous, not differentiable, or f(a) ≠ f(b), then Rolle’s Theorem does not hold.

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