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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Question
![**Title: Differentiating the Function \( f(x) = \sqrt{x} + \sqrt{\sqrt{x}} \)**
---
**Objective:**
Differentiate the function \( f(x) = \sqrt{x} + \sqrt{\sqrt{x}} \).
**Steps:**
1. **Rewrite the Function:**
- Given \( f(x) = \sqrt{x} + \sqrt{\sqrt{x}} \).
- Rewrite as \( f(x) = (x + x^{1/2})^{1/2} \) or \( (x + (x^{1/2}))^{1/2} \).
2. **Apply the Chain Rule:**
- Start with the derivative of the outer function:
\[
\frac{d}{dx} (x + x^{1/2})^{1/2} = \frac{1}{2} (x + (x^{1/2}))^{-1/2} \cdot \frac{d}{dx} (x + (x^{1/2}))
\]
3. **Derivatives Inside the Chain Rule:**
- Use the chain rule:
\[
\frac{1}{2} \left(\frac{1}{\sqrt{x + \sqrt{x}}} \right) \cdot \left( \frac{d}{dx} (x) + \frac{d}{dx} (x^{1/2}) \right)
\]
- Differentiate each component:
- \( \frac{d}{dx}(x) = 1 \)
- \( \frac{d}{dx}(x^{1/2}) = \frac{1}{2\sqrt{x}} \)
4. **Combine and Simplify:**
- Now combine:
\[
\frac{1}{2\sqrt{x+\sqrt{x}}} \cdot \left( 1 + \frac{1}{2\sqrt{x}} \right)
\]
5. **Final Expression:**
- The simplified expression becomes:
\[
\frac{1}{2\sqrt{x+\sqrt{x}}} \cdot \left( \frac{1}{2\sqrt{x}} \right)
\]
- Which simplifies to:
\[
\frac{1}{2\sqrt{x+\sqrt{x}}} \cd](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Faeadb183-1175-48ee-be1d-be4cbd36e1e9%2F9935b93a-001d-422d-b857-ec3a5484a015%2Febsejb4_processed.jpeg&w=3840&q=75)
Transcribed Image Text:**Title: Differentiating the Function \( f(x) = \sqrt{x} + \sqrt{\sqrt{x}} \)**
---
**Objective:**
Differentiate the function \( f(x) = \sqrt{x} + \sqrt{\sqrt{x}} \).
**Steps:**
1. **Rewrite the Function:**
- Given \( f(x) = \sqrt{x} + \sqrt{\sqrt{x}} \).
- Rewrite as \( f(x) = (x + x^{1/2})^{1/2} \) or \( (x + (x^{1/2}))^{1/2} \).
2. **Apply the Chain Rule:**
- Start with the derivative of the outer function:
\[
\frac{d}{dx} (x + x^{1/2})^{1/2} = \frac{1}{2} (x + (x^{1/2}))^{-1/2} \cdot \frac{d}{dx} (x + (x^{1/2}))
\]
3. **Derivatives Inside the Chain Rule:**
- Use the chain rule:
\[
\frac{1}{2} \left(\frac{1}{\sqrt{x + \sqrt{x}}} \right) \cdot \left( \frac{d}{dx} (x) + \frac{d}{dx} (x^{1/2}) \right)
\]
- Differentiate each component:
- \( \frac{d}{dx}(x) = 1 \)
- \( \frac{d}{dx}(x^{1/2}) = \frac{1}{2\sqrt{x}} \)
4. **Combine and Simplify:**
- Now combine:
\[
\frac{1}{2\sqrt{x+\sqrt{x}}} \cdot \left( 1 + \frac{1}{2\sqrt{x}} \right)
\]
5. **Final Expression:**
- The simplified expression becomes:
\[
\frac{1}{2\sqrt{x+\sqrt{x}}} \cdot \left( \frac{1}{2\sqrt{x}} \right)
\]
- Which simplifies to:
\[
\frac{1}{2\sqrt{x+\sqrt{x}}} \cd
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