22) Sketch the graph of f(x) = xln(x) and label important points on the graph. Look for intercepts, domain, range, critical points and inflection points. And consider asymptotes as well. (You may need to use L'Hopitals Rule )

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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### Graphing \( f(x) = x \ln(x) \)

Task: Sketch the graph of \( f(x) = x \ln(x) \) and label important points on the graph.

Guidelines:
- Look for intercepts, domain, range, critical points, and inflection points.
- Consider asymptotes as well.

**Tip:** You may need to use L'Hôpital's Rule to analyze the function.

### Step-by-Step Instructions

1. **Intercepts:**
   - To find the intercepts, solve \( f(x) = 0 \).
   - Since \( f(x) = x \ln(x) \), set \( x \ln(x) = 0 \).
     - \( x = 0 \) or \( \ln(x) = 0 \).
     - \( \ln(x) = 0 \) implies \( x = 1 \).
   - Therefore, the x-intercepts are at \( x = 0 \) and \( x = 1 \).

2. **Domain:**
   - The natural logarithm function, \( \ln(x) \), is defined for \( x > 0 \).
   - Hence, the domain of \( f(x) \) is \( (0, \infty) \).

3. **Range:**
   - To find the range of \( f(x) \), analyze the behavior as \( x \to 0^+ \) and as \( x \to \infty \).
     - As \( x \to 0^+ \), \( x \ln(x) \to 0 \) (approaching from below the x-axis).
     - As \( x \to \infty \), \( x \ln(x) \to \infty \).
   - Thus, the range of \( f(x) \) is \( (-\infty, \infty) \).

4. **Critical Points:**
   - To find critical points, compute the derivative \( f'(x) \).
     - \( f'(x) = \frac{d}{dx}[x \ln(x)] = \ln(x) + 1 \).
   - Set the derivative to zero and solve for \( x \).
     - \( \ln(x) + 1 = 0 \) implies \( \ln(x) = -1 \).
     - Solving for \( x \), \( x
Transcribed Image Text:### Graphing \( f(x) = x \ln(x) \) Task: Sketch the graph of \( f(x) = x \ln(x) \) and label important points on the graph. Guidelines: - Look for intercepts, domain, range, critical points, and inflection points. - Consider asymptotes as well. **Tip:** You may need to use L'Hôpital's Rule to analyze the function. ### Step-by-Step Instructions 1. **Intercepts:** - To find the intercepts, solve \( f(x) = 0 \). - Since \( f(x) = x \ln(x) \), set \( x \ln(x) = 0 \). - \( x = 0 \) or \( \ln(x) = 0 \). - \( \ln(x) = 0 \) implies \( x = 1 \). - Therefore, the x-intercepts are at \( x = 0 \) and \( x = 1 \). 2. **Domain:** - The natural logarithm function, \( \ln(x) \), is defined for \( x > 0 \). - Hence, the domain of \( f(x) \) is \( (0, \infty) \). 3. **Range:** - To find the range of \( f(x) \), analyze the behavior as \( x \to 0^+ \) and as \( x \to \infty \). - As \( x \to 0^+ \), \( x \ln(x) \to 0 \) (approaching from below the x-axis). - As \( x \to \infty \), \( x \ln(x) \to \infty \). - Thus, the range of \( f(x) \) is \( (-\infty, \infty) \). 4. **Critical Points:** - To find critical points, compute the derivative \( f'(x) \). - \( f'(x) = \frac{d}{dx}[x \ln(x)] = \ln(x) + 1 \). - Set the derivative to zero and solve for \( x \). - \( \ln(x) + 1 = 0 \) implies \( \ln(x) = -1 \). - Solving for \( x \), \( x
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