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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This is a 2 part question. Please assist with both images. Thanks so much
![**Problem Statement:**
Given the equation \((x-2)^2 - \ln x = 0\).
**Objective:**
Show that this equation has a solution on the interval \([e, 4]\).
**Explanation:**
To solve this problem, you might consider using methods like the Intermediate Value Theorem. This theorem suggests that if a continuous function changes sign over an interval, it must have a root in that interval. Here’s a brief guide on how you might approach this:
1. **Function Definition:**
Define the function \( f(x) = (x-2)^2 - \ln x \).
2. **Continuity:**
Check if \( f(x) \) is continuous on \([e, 4]\). Since polynomials and the natural logarithm (\(\ln x\)) are both continuous where defined, and their sum/difference is also continuous, \( f(x) \) is continuous on this interval.
3. **Sign Change:**
Evaluate \( f(e) \) and \( f(4) \):
- Calculate \( f(e) = (e-2)^2 - \ln e = (e-2)^2 - 1 \).
- Calculate \( f(4) = (4-2)^2 - \ln 4 = 4 - \ln 4 \).
Determine if \( f(e) \) and \( f(4) \) have opposite signs. If they do, by the Intermediate Value Theorem, there is at least one \( c \) in the interval \([e, 4]\) such that \( f(c) = 0 \).
4. **Conclusion:**
If a sign change is confirmed, then the solution exists within the specified interval.
By verifying these steps, you can show that the given equation has a solution on \([e, 4]\).](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fba13667f-f60c-45eb-87f2-7662478f2e6d%2F4e4987e8-ed3f-4a46-8bf9-ce85f2a24b80%2Fc2aywrh_processed.jpeg&w=3840&q=75)
Transcribed Image Text:**Problem Statement:**
Given the equation \((x-2)^2 - \ln x = 0\).
**Objective:**
Show that this equation has a solution on the interval \([e, 4]\).
**Explanation:**
To solve this problem, you might consider using methods like the Intermediate Value Theorem. This theorem suggests that if a continuous function changes sign over an interval, it must have a root in that interval. Here’s a brief guide on how you might approach this:
1. **Function Definition:**
Define the function \( f(x) = (x-2)^2 - \ln x \).
2. **Continuity:**
Check if \( f(x) \) is continuous on \([e, 4]\). Since polynomials and the natural logarithm (\(\ln x\)) are both continuous where defined, and their sum/difference is also continuous, \( f(x) \) is continuous on this interval.
3. **Sign Change:**
Evaluate \( f(e) \) and \( f(4) \):
- Calculate \( f(e) = (e-2)^2 - \ln e = (e-2)^2 - 1 \).
- Calculate \( f(4) = (4-2)^2 - \ln 4 = 4 - \ln 4 \).
Determine if \( f(e) \) and \( f(4) \) have opposite signs. If they do, by the Intermediate Value Theorem, there is at least one \( c \) in the interval \([e, 4]\) such that \( f(c) = 0 \).
4. **Conclusion:**
If a sign change is confirmed, then the solution exists within the specified interval.
By verifying these steps, you can show that the given equation has a solution on \([e, 4]\).
![**Problem Statement:**
Given \( f(x) = (x - 2)^2 - \ln x = 0 \). Show that it has a solution on the interval \([1, 2]\).
**Explanation:**
The problem asks to demonstrate that the equation \( f(x) = (x - 2)^2 - \ln x = 0 \) has at least one solution within the interval \([1, 2]\).
**Approach:**
1. **Substitute Endpoints:**
- Calculate \( f(1) \) and \( f(2) \) to find the values of the function at the endpoints of the interval.
2. **Continuous Function:**
- Show that \( f(x) \) is continuous on \([1, 2]\). The function \( (x - 2)^2 \) is a polynomial, hence continuous everywhere, and \(-\ln x\) is continuous for \( x > 0 \).
3. **Intermediate Value Theorem (IVT):**
- Apply the Intermediate Value Theorem, which states that if a function \( f \) is continuous on a closed interval \([a, b]\) and \( f(a) \) and \( f(b) \) have opposite signs, then there exists at least one \( c \) in \((a, b)\) such that \( f(c) = 0 \).
By following these steps, you can show the existence of a solution for the equation within the given interval.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fba13667f-f60c-45eb-87f2-7662478f2e6d%2F4e4987e8-ed3f-4a46-8bf9-ce85f2a24b80%2Fyybh9z_processed.jpeg&w=3840&q=75)
Transcribed Image Text:**Problem Statement:**
Given \( f(x) = (x - 2)^2 - \ln x = 0 \). Show that it has a solution on the interval \([1, 2]\).
**Explanation:**
The problem asks to demonstrate that the equation \( f(x) = (x - 2)^2 - \ln x = 0 \) has at least one solution within the interval \([1, 2]\).
**Approach:**
1. **Substitute Endpoints:**
- Calculate \( f(1) \) and \( f(2) \) to find the values of the function at the endpoints of the interval.
2. **Continuous Function:**
- Show that \( f(x) \) is continuous on \([1, 2]\). The function \( (x - 2)^2 \) is a polynomial, hence continuous everywhere, and \(-\ln x\) is continuous for \( x > 0 \).
3. **Intermediate Value Theorem (IVT):**
- Apply the Intermediate Value Theorem, which states that if a function \( f \) is continuous on a closed interval \([a, b]\) and \( f(a) \) and \( f(b) \) have opposite signs, then there exists at least one \( c \) in \((a, b)\) such that \( f(c) = 0 \).
By following these steps, you can show the existence of a solution for the equation within the given interval.
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