rolle’s theorem – f c frolle’s theorem – let f be continuous on the closed interval [a, b]...

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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 one number c in (a, b) such that ' 0 f c . Examples: Find the two x-intercepts of the function f and show that f’(x) = 0 at some point between the two x-intercepts. 1. 3 f x xx 2. 3 1 f x x x Examples: Determine whether Rolle’s Theorem can be applied to f on the closed interval. If Rolle’s Theorem can be applied, find all values c in the open interval such that f’(c) =0. If Rolle’s Theorem cannot be applied, explain why not. 1. 2 5 4, 1, 4 f x x x

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Page 1: Rolle’s Theorem – f c fRolle’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 '0 then there is at least

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 one number c in (a, b) such that ' 0f c .

Examples: Find the two x-intercepts of the function f and show that f’(x) = 0 at some point between the

two x-intercepts.

1. 3f x x x

2. 3 1f x x x

Examples: Determine whether Rolle’s Theorem can be applied to f on the closed interval. If Rolle’s

Theorem can be applied, find all values c in the open interval such that f’(c) =0. If Rolle’s Theorem

cannot be applied, explain why not.

1. 2 5 4, 1,4f x x x

Page 2: Rolle’s Theorem – f c fRolle’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 '0 then there is at least

2. 2/3 1, 8,8f x x

3. 2 2 3

,[ 1,3]2

x xf x

x

4. 2 1

, 1,1x

f xx

5. cos , 0,2g x x

Page 3: Rolle’s Theorem – f c fRolle’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 '0 then there is at least

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

'f b f a

f cb a

Examples: Determine whether the MVT can be applied to f on the closed interval. If the MVT can be

applied, find all values of c given by the theorem. If the MVT cannot be applied, explain why not.

1. 3, 0,1f x x

2. 4 8 , 0,2f x x x

3. 1, 1,2

xf x

x

4. sin , 0,f x x

Page 4: Rolle’s Theorem – f c fRolle’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 '0 then there is at least

Example: A plane begins its takeoff at 2:00 PM on a 2500 mile flight. After 5.5 hours, the plane arrives at

its destination. Explain why there are at least two times during the flight when the speed of the plane is

400 mph.

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