Use the chain rule to find the derivative of 5(- 5x- 82)4 You do not need to expand out your answer.

Calculus For The Life Sciences
2nd Edition
ISBN:9780321964038
Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Chapter3: The Derivative
Section3.5: Graphical Differentiation
Problem 2E
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**Calculus - Chain Rule Application**

### Problem Statement

Use the chain rule to find the derivative of:

\[ 5\left( -5x^4 - 8x^3 \right)^{14} \]

You do not need to expand out your answer.

### Solution

To tackle this problem, first identify the outer and inner functions for applying the chain rule. Here's a structured approach:

1. **Outer Function (u)**: \( u = 5z^{14} \)
   
2. **Inner Function (z)**: \( z = -5x^4 - 8x^3 \)

3. **Derivative of Outer Function \( \frac{du}{dz} \)**: 

   \[ \frac{d}{dz}(5z^{14}) = 5 \cdot 14z^{13} = 70z^{13} \]
   
4. **Derivative of Inner Function \( \frac{dz}{dx} \)**: 

   \[ \frac{d}{dx}(-5x^4 - 8x^3) = -20x^3 - 24x^2 \]

5. **Combine Using Chain Rule**:

   \[ \frac{du}{dx} = \frac{du}{dz} \cdot \frac{dz}{dx} \]

   Substituting back the inner function (z):

   \[ \frac{du}{dx} = 70(-5x^4 - 8x^3)^{13} \cdot (-20x^3 - 24x^2) \]

This is your final result. Remember, it is not necessary to simplify further unless explicitly required.
Transcribed Image Text:**Calculus - Chain Rule Application** ### Problem Statement Use the chain rule to find the derivative of: \[ 5\left( -5x^4 - 8x^3 \right)^{14} \] You do not need to expand out your answer. ### Solution To tackle this problem, first identify the outer and inner functions for applying the chain rule. Here's a structured approach: 1. **Outer Function (u)**: \( u = 5z^{14} \) 2. **Inner Function (z)**: \( z = -5x^4 - 8x^3 \) 3. **Derivative of Outer Function \( \frac{du}{dz} \)**: \[ \frac{d}{dz}(5z^{14}) = 5 \cdot 14z^{13} = 70z^{13} \] 4. **Derivative of Inner Function \( \frac{dz}{dx} \)**: \[ \frac{d}{dx}(-5x^4 - 8x^3) = -20x^3 - 24x^2 \] 5. **Combine Using Chain Rule**: \[ \frac{du}{dx} = \frac{du}{dz} \cdot \frac{dz}{dx} \] Substituting back the inner function (z): \[ \frac{du}{dx} = 70(-5x^4 - 8x^3)^{13} \cdot (-20x^3 - 24x^2) \] This is your final result. Remember, it is not necessary to simplify further unless explicitly required.
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ISBN:
9780321964038
Author:
GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:
Pearson Addison Wesley,