If c is a critical value of a function f, then whi flC)=0 f(c) is undefined f(C)=0 f(c) is undefined none of these

Calculus: Early Transcendentals
8th Edition
ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
Chapter1: Functions And Models
Section: Chapter Questions
Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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**Understanding Critical Values in Functions**

When studying calculus, it's important to understand the concept of critical values in functions. Here we examine a question that helps to identify what must be true if a certain value \( c \) is a critical value of a function \( f \).

**Scenario:**
You are given the function \( f \) and need to determine which of the following statements must be true if \( c \) is a critical value of \( f \):

1. \( f(c)=0 \)
2. \( f(c) \) is undefined
3. \( f'(c)=0 \)
4. \( f'(c) \) is undefined
5. None of these

**Options Explained:**
- **\( f(c)=0 \):** Suggests that the function \( f \) evaluated at \( c \) equals zero.
- **\( f(c) \) is undefined:** Implies that the function \( f \) does not have a value at \( c \).
- **\( f'(c)=0 \):** Indicates that the derivative of \( f \) at \( c \) equals zero.
- **\( f'(c) \) is undefined:** Means that the derivative of \( f \) is not defined at \( c \).
- **None of these:** Indicates that none of the given statements is true about the critical value \( c \).

**Understanding Critical Values:**
A critical value \( c \) of a function \( f \) is a point where the derivative \( f' \) is either zero or undefined. This implies that at these points, the slope of the tangent to the graph of \( f \) is either horizontal (if \( f'(c)=0 \)) or the function has a cusp or vertical tangent (if \( f'(c) \) is undefined).

Thus, the correct statements must be:
- \( f'(c)=0 \)
- \( f'(c) \) is undefined
Transcribed Image Text:**Understanding Critical Values in Functions** When studying calculus, it's important to understand the concept of critical values in functions. Here we examine a question that helps to identify what must be true if a certain value \( c \) is a critical value of a function \( f \). **Scenario:** You are given the function \( f \) and need to determine which of the following statements must be true if \( c \) is a critical value of \( f \): 1. \( f(c)=0 \) 2. \( f(c) \) is undefined 3. \( f'(c)=0 \) 4. \( f'(c) \) is undefined 5. None of these **Options Explained:** - **\( f(c)=0 \):** Suggests that the function \( f \) evaluated at \( c \) equals zero. - **\( f(c) \) is undefined:** Implies that the function \( f \) does not have a value at \( c \). - **\( f'(c)=0 \):** Indicates that the derivative of \( f \) at \( c \) equals zero. - **\( f'(c) \) is undefined:** Means that the derivative of \( f \) is not defined at \( c \). - **None of these:** Indicates that none of the given statements is true about the critical value \( c \). **Understanding Critical Values:** A critical value \( c \) of a function \( f \) is a point where the derivative \( f' \) is either zero or undefined. This implies that at these points, the slope of the tangent to the graph of \( f \) is either horizontal (if \( f'(c)=0 \)) or the function has a cusp or vertical tangent (if \( f'(c) \) is undefined). Thus, the correct statements must be: - \( f'(c)=0 \) - \( f'(c) \) is undefined
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