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# Solution - Examine If Rolle’S Theorem is Applicable to Any of the Following Functions. Can You Say Some Thing About the Converse of Rolle’S Theorem from These Examples? F (X) = [X] for X ∈ [– 2, 2] - CBSE (Arts) Class 12 - Mathematics

ConceptMean Value Theorem

#### Question

Examine if Rolle’s Theorem is applicable to any of the following functions. Can you say some thing about the converse of Rolle’s Theorem from these examples?

f (x) = [x] for x ∈ [– 2, 2]

#### Solution

By Rolle’s Theorem, for a function f: [a, b] → R, if

(a) f is continuous on [a, b]

(b) f is differentiable on (a, b)

(c) f (a) = f (b)

then, there exists some c ∈ (a, b) such that f'(c) = 0

Therefore, Rolle’s Theorem is not applicable to those functions that do not satisfy any of the three conditions of the hypothesis.

f (x) = [x] for x ∈ [– 2, 2]

It is evident that the given function f (x) is not continuous at every integral point.

In particular, f(x) is not continuous at = −2 and = 2

⇒ f (x) is not continuous in [−2, 2].

Is there an error in this question or solution?

#### APPEARS IN

NCERT Mathematics Textbook for Class 12 Part 1 (with solutions)
Chapter 5: Continuity and Differentiability
Q: 2.2 | Page no. 186

#### Reference Material

Solution for question: Examine If Rolle’S Theorem is Applicable to Any of the Following Functions. Can You Say Some Thing About the Converse of Rolle’S Theorem from These Examples? F (X) = [X] for X ∈ [– 2, 2] concept: null - Mean Value Theorem. For the courses CBSE (Arts), CBSE (Science), CBSE (Commerce)
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