Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter5: Inverse, Exponential, And Logarithmic Functions
Section5.6: Exponential And Logarithmic Equations
Problem 40E
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![## Derivative of a Logarithmic Function
In this problem, we are asked to find the derivative of the natural logarithm function:
\[ \ln \left( \frac{(5x+8)^3}{x^6+10} \right) \]
### Steps to Solve
1. **Simplify the Logarithmic Expression:**
Using the properties of logarithms, we can simplify the given expression:
\[ \ln \left( \frac{(5x+8)^3}{x^6+10} \right) = \ln (5x+8)^3 - \ln (x^6+10) \]
According to the power rule of logarithms \( \ln (a^b) = b \ln a \):
\[ = 3 \ln (5x+8) - \ln (x^6+10) \]
2. **Differentiate the Simplified Expression:**
Now, we can find the derivative of this simplified expression:
\[ \frac{d}{dx} \left[ 3 \ln (5x+8) - \ln (x^6+10) \right] \]
Applying the chain rule and the derivative of the natural logarithm function \( \frac{d}{dx} [\ln u] = \frac{1}{u} \cdot \frac{du}{dx} \):
\[ = 3 \cdot \frac{1}{5x+8} \cdot \frac{d}{dx} [5x+8] - \frac{1}{x^6+10} \cdot \frac{d}{dx} [x^6+10] \]
3. **Evaluate the Derivatives of the Inside Functions:**
\[ \frac{d}{dx} [5x+8] = 5 \]
\[ \frac{d}{dx} [x^6+10] = 6x^5 \]
4. **Combine the Results:**
Substituting these derivatives back into the expression:
\[ = 3 \cdot \frac{5}{5x+8} - \frac{6x^5}{x^6+10} \]
Simplify the terms:
\[ = \frac{15}{5x+8} - \frac](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F2a9572e1-cd0e-48a9-8ed8-4d34eb3e96b9%2F7f166fbc-c8ef-41e5-a65f-eba9404e6ffa%2Fx3sbdpo_processed.png&w=3840&q=75)
Transcribed Image Text:## Derivative of a Logarithmic Function
In this problem, we are asked to find the derivative of the natural logarithm function:
\[ \ln \left( \frac{(5x+8)^3}{x^6+10} \right) \]
### Steps to Solve
1. **Simplify the Logarithmic Expression:**
Using the properties of logarithms, we can simplify the given expression:
\[ \ln \left( \frac{(5x+8)^3}{x^6+10} \right) = \ln (5x+8)^3 - \ln (x^6+10) \]
According to the power rule of logarithms \( \ln (a^b) = b \ln a \):
\[ = 3 \ln (5x+8) - \ln (x^6+10) \]
2. **Differentiate the Simplified Expression:**
Now, we can find the derivative of this simplified expression:
\[ \frac{d}{dx} \left[ 3 \ln (5x+8) - \ln (x^6+10) \right] \]
Applying the chain rule and the derivative of the natural logarithm function \( \frac{d}{dx} [\ln u] = \frac{1}{u} \cdot \frac{du}{dx} \):
\[ = 3 \cdot \frac{1}{5x+8} \cdot \frac{d}{dx} [5x+8] - \frac{1}{x^6+10} \cdot \frac{d}{dx} [x^6+10] \]
3. **Evaluate the Derivatives of the Inside Functions:**
\[ \frac{d}{dx} [5x+8] = 5 \]
\[ \frac{d}{dx} [x^6+10] = 6x^5 \]
4. **Combine the Results:**
Substituting these derivatives back into the expression:
\[ = 3 \cdot \frac{5}{5x+8} - \frac{6x^5}{x^6+10} \]
Simplify the terms:
\[ = \frac{15}{5x+8} - \frac
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