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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![### Finding the Derivative of the Function
Given the function:
\[ f(x) = \frac{1}{\sqrt[5]{(5x + 1)^2}} \]
To find the derivative of the function \( f(x) \), follow these steps:
1. **Rewrite the Function:**
We start by expressing the given function in a more suitable form for differentiation. The original function is:
\[ f(x) = \frac{1}{(5x + 1)^{2/5}} \]
This can be rewritten using negative exponents:
\[ f(x) = (5x + 1)^{-2/5} \]
2. **Differentiate the Function:**
Apply the chain rule to differentiate \( f(x) \). The chain rule states that if a function \( u(x) \) is differentiable and can be expressed as \( [u(x)]^n \), then:
\[
\frac{d}{dx} [u(x)]^n = n [u(x)]^{n-1} \cdot \frac{du}{dx}
\]
Here, \( u(x) = 5x + 1 \) and \( n = -2/5 \).
First, let’s find \( \frac{d}{dx}(5x + 1) \):
\[
\frac{d}{dx}(5x + 1) = 5
\]
Now, apply the chain rule:
\[
f'(x) = \frac{d}{dx} (5x + 1)^{-2/5} = -\frac{2}{5} (5x + 1)^{-2/5 - 1} \cdot 5
\]
3. **Simplify the Derivative:**
Simplify the expression obtained:
\[
f'(x) = -\frac{2}{5} (5x + 1)^{-7/5} \cdot 5
\]
\[
f'(x) = -2 (5x + 1)^{-7/5}
\]
Therefore, the derivative of the given function is:
\[ \boxed{ f'(x) = -2 (5x + 1)^{-7/5} } \]](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Ffc8d17bc-eeef-4f5c-bae1-870d59d58eb9%2F061c6e09-7810-4439-97dd-f270e375592d%2F09bbdbf.png&w=3840&q=75)
Transcribed Image Text:### Finding the Derivative of the Function
Given the function:
\[ f(x) = \frac{1}{\sqrt[5]{(5x + 1)^2}} \]
To find the derivative of the function \( f(x) \), follow these steps:
1. **Rewrite the Function:**
We start by expressing the given function in a more suitable form for differentiation. The original function is:
\[ f(x) = \frac{1}{(5x + 1)^{2/5}} \]
This can be rewritten using negative exponents:
\[ f(x) = (5x + 1)^{-2/5} \]
2. **Differentiate the Function:**
Apply the chain rule to differentiate \( f(x) \). The chain rule states that if a function \( u(x) \) is differentiable and can be expressed as \( [u(x)]^n \), then:
\[
\frac{d}{dx} [u(x)]^n = n [u(x)]^{n-1} \cdot \frac{du}{dx}
\]
Here, \( u(x) = 5x + 1 \) and \( n = -2/5 \).
First, let’s find \( \frac{d}{dx}(5x + 1) \):
\[
\frac{d}{dx}(5x + 1) = 5
\]
Now, apply the chain rule:
\[
f'(x) = \frac{d}{dx} (5x + 1)^{-2/5} = -\frac{2}{5} (5x + 1)^{-2/5 - 1} \cdot 5
\]
3. **Simplify the Derivative:**
Simplify the expression obtained:
\[
f'(x) = -\frac{2}{5} (5x + 1)^{-7/5} \cdot 5
\]
\[
f'(x) = -2 (5x + 1)^{-7/5}
\]
Therefore, the derivative of the given function is:
\[ \boxed{ f'(x) = -2 (5x + 1)^{-7/5} } \]
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