Sketch the graph of a function f having the given characteristics. f(0) = f(8) = 0 f'(x) > 0 for x < 4 f'(4) = 0 f"(x) < O for x > 4 f"(x) < 0

Calculus: Early Transcendentals
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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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# Graphing a Function with Given Characteristics

To sketch the graph of a function \( f \) with the specified features, consider the following characteristics:

1. **Endpoints:**
   - \( f(0) = f(8) = 0 \)  
   The function intersects the x-axis at \( x = 0 \) and \( x = 8 \).

2. **Increasing and Decreasing Intervals:**
   - \( f'(x) > 0 \) for \( x < 4 \)  
   The function is increasing for values of \( x \) less than 4.
   - \( f'(4) = 0 \)  
   The function has a horizontal tangent (local extremum) at \( x = 4 \).
   - \( f'(x) < 0 \) for \( x > 4 \)  
   The function is decreasing for values of \( x \) greater than 4.

3. **Concavity:**
   - \( f''(x) < 0 \)  
   The function is concave down for all \( x \).

### Analysis

- **Critical Point:**  
  At \( x = 4 \), the function has a critical point where the derivative is zero. This could be a maximum since the function changes from increasing to decreasing here.

- **Shape:**  
  Since the function is concave down for all \( x \), it appears as an inverted "U" shape, peaking at \( x = 4 \) and tapering off as \( x \) approaches 0 and 8.

### Diagram Explanation

A sketch of the function \( f \) with these characteristics would show:
- The x-axis intercepts at \( (0, 0) \) and \( (8, 0) \).
- A peak at \( (4, f(4)) \), which is a local maximum.
- The curve ascending towards the maximum from the left side (from \( x = 0 \) to \( x = 4 \)).
- The curve descending after the maximum towards the right side (from \( x = 4 \) to \( x = 8 \)), illustrating the concavity and behavioral traits as outlined.

This visualization helps to comprehend the behavior of the function based on the derivatives provided.
Transcribed Image Text:# Graphing a Function with Given Characteristics To sketch the graph of a function \( f \) with the specified features, consider the following characteristics: 1. **Endpoints:** - \( f(0) = f(8) = 0 \) The function intersects the x-axis at \( x = 0 \) and \( x = 8 \). 2. **Increasing and Decreasing Intervals:** - \( f'(x) > 0 \) for \( x < 4 \) The function is increasing for values of \( x \) less than 4. - \( f'(4) = 0 \) The function has a horizontal tangent (local extremum) at \( x = 4 \). - \( f'(x) < 0 \) for \( x > 4 \) The function is decreasing for values of \( x \) greater than 4. 3. **Concavity:** - \( f''(x) < 0 \) The function is concave down for all \( x \). ### Analysis - **Critical Point:** At \( x = 4 \), the function has a critical point where the derivative is zero. This could be a maximum since the function changes from increasing to decreasing here. - **Shape:** Since the function is concave down for all \( x \), it appears as an inverted "U" shape, peaking at \( x = 4 \) and tapering off as \( x \) approaches 0 and 8. ### Diagram Explanation A sketch of the function \( f \) with these characteristics would show: - The x-axis intercepts at \( (0, 0) \) and \( (8, 0) \). - A peak at \( (4, f(4)) \), which is a local maximum. - The curve ascending towards the maximum from the left side (from \( x = 0 \) to \( x = 4 \)). - The curve descending after the maximum towards the right side (from \( x = 4 \) to \( x = 8 \)), illustrating the concavity and behavioral traits as outlined. This visualization helps to comprehend the behavior of the function based on the derivatives provided.
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