Math Problem Statement

Suppose that a function f is continuous on [1, 4] except at x=3 (therefore it does not satisfy the hypotheses of the Intermediate Value Theorem), and that f(1)=1 and f(4)=3. Let N=2. Sketch two possible graphs of f, one showing that f might not satisfy the conclusion of the Intermediate Value Theorem, and one showing that f might still satisfy the conclusion of the Intermediate Value Theorem.

Solution

The question discusses the Intermediate Value Theorem (IVT) and asks for two sketches based on a function ff defined on the interval [1,4][1, 4], with some discontinuity at x=3x = 3. Here's the analysis:

Intermediate Value Theorem (IVT):

The IVT states that if a function is continuous on a closed interval [a,b][a, b], and NN is any value between f(a)f(a) and f(b)f(b), then there exists at least one point c(a,b)c \in (a, b) such that f(c)=Nf(c) = N.

In this case:

  • f(1)=1f(1) = 1
  • f(4)=3f(4) = 3
  • There is a discontinuity at x=3x = 3.
  • You are given N=2N = 2 and need to explore whether the function ff might or might not satisfy the conclusion of the IVT, given that it's discontinuous at x=3x = 3.

Two scenarios:

  1. Graph where the function does not satisfy the conclusion of the IVT:

    • The function could "jump" at x=3x = 3, meaning there's a break or gap at that point.
    • Since the function is discontinuous at x=3x = 3, it's possible that the function never attains the value f(x)=2f(x) = 2 in the interval [1,4][1, 4].
    • In this case, the discontinuity prevents the IVT from applying.
  2. Graph where the function might still satisfy the conclusion of the IVT:

    • Even though there is a discontinuity at x=3x = 3, the function could still take the value 22 at some point between 11 and 44, perhaps at x=2x = 2.
    • The function could be continuous on [1,3)[1, 3) and (3,4](3, 4], with a discontinuity at x=3x = 3, but still pass through the value 22 at some point, which would satisfy the conclusion of the IVT.

Would you like me to create the sketches for both cases or explain the details further?


Related Questions:

  1. What are the key conditions for the Intermediate Value Theorem to apply?
  2. Why is the discontinuity at x=3x = 3 significant for the IVT?
  3. Could there be other values for NN that the function ff must satisfy under the IVT?
  4. What happens to the IVT if a function is only piecewise continuous?
  5. How does the behavior of f(x)f(x) at x=3x = 3 affect the possibility of satisfying the IVT?

Tip:

When verifying the IVT, always check for both the continuity condition and the value condition in the interval.

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Math Problem Analysis

Mathematical Concepts

Intermediate Value Theorem
Discontinuity in Functions
Graphing Functions

Formulas

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Theorems

Intermediate Value Theorem

Suitable Grade Level

Undergraduate or Advanced High School (Grades 11-12)