Math Problem Statement

The graph of the function f satisfies lim(x→2)f(x)=2. Determine a value of δ>0 that satisfies: If 0 < |x-2| < δ, then |f(x)-2| < 1.

Solution

To solve this problem and determine a value of δ that satisfies the given condition:

Given:

  1. limx2f(x)=2\lim_{x \to 2} f(x) = 2.
  2. The condition: If 0<x2<δ0 < |x - 2| < \delta, then f(x)2<1|f(x) - 2| < 1.

We need to find a δ such that this condition holds true.


Steps:

  1. The graph shows f(x)f(x) as increasing and passing through (2,2)(2, 2), and the function is continuous.
  2. The inequality f(x)2<1|f(x) - 2| < 1 means that f(x)f(x) must be between 11 and 33: 1<f(x)<3.1 < f(x) < 3.
  3. We now examine the graph around x=2x = 2 to determine where f(x)f(x) remains in this range.

From the graph:

  • When xx is close to 22, f(x)f(x) remains between 11 and 33 approximately within the interval 1x31 \leq x \leq 3.

Thus, the distance x2|x - 2| must satisfy: 0<x2<1.0 < |x - 2| < 1.


Solution:

δ1.\delta \leq 1.


Final Answer:

δ1.\delta \leq 1.

Would you like a detailed explanation of the epsilon-delta concept used here? Let me know!


Related Questions:

  1. What is the definition of a limit using the epsilon-delta approach?
  2. How does the graph of a function affect the choice of delta (δ\delta)?
  3. Can the value of δ\delta vary for different values of epsilon (ϵ\epsilon)?
  4. What happens if a function is discontinuous at x=2x = 2?
  5. How can we generalize this approach for a more complex function?

Tip:

When working with limits and the epsilon-delta definition, always look closely at the behavior of the function near the limit point!

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Math Problem Analysis

Mathematical Concepts

Limits
Continuity
Epsilon-Delta Definition of a Limit

Formulas

|x - a| < δ ⟹ |f(x) - L| < ε

Theorems

Epsilon-Delta Definition of Limits

Suitable Grade Level

Grades 11-12