Find the Derivative of the Function: 1 f(x) (5х + 1)

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
### 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:
\[ \boxed{ f'(x) = -2 (5x + 1)^{-7/5} } \]
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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