For the function f(x) = 3x- 4x +3x +5x +6, find f'"(x), the third derivative of f, and f(x), the fourth derivative of f.

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Author:James Stewart
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Chapter1: Functions And Models
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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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5.3 #5 Part 1 of 2
### Calculus: Higher Order Derivatives

**Problem Statement:**

For the function \( f(x) = 3x^5 - 4x^4 + 3x^3 + 5x^2 + 6 \), find \( f'''(x) \), the third derivative of \( f \), and \( f^{(4)}(x) \), the fourth derivative of \( f \).

**Solution:**

1. **First Derivative, \( f'(x) \):**
   - Differentiate each term with respect to \( x \):
     - \( 3x^5 \) becomes \( 15x^4 \)
     - \( -4x^4 \) becomes \( -16x^3 \)
     - \( 3x^3 \) becomes \( 9x^2 \)
     - \( 5x^2 \) becomes \( 10x \)
     - \( 6 \) becomes \( 0 \)
   
   Thus, 
   \[
   f'(x) = 15x^4 - 16x^3 + 9x^2 + 10x
   \]

2. **Second Derivative, \( f''(x) \):**
   - Differentiate \( f'(x) \):
     - \( 15x^4 \) becomes \( 60x^3 \)
     - \( -16x^3 \) becomes \( -48x^2 \)
     - \( 9x^2 \) becomes \( 18x \)
     - \( 10x \) becomes \( 10 \)
   
   Thus, 
   \[
   f''(x) = 60x^3 - 48x^2 + 18x + 10
   \]

3. **Third Derivative, \( f'''(x) \):**
   - Differentiate \( f''(x) \):
     - \( 60x^3 \) becomes \( 180x^2 \)
     - \( -48x^2 \) becomes \( -96x \)
     - \( 18x \) becomes \( 18 \)
     - \( 10 \) becomes \( 0 \)
   
   Thus, 
   \[
   f'''(x) = 180x^2 - 96x + 18
   \]
Transcribed Image Text:### Calculus: Higher Order Derivatives **Problem Statement:** For the function \( f(x) = 3x^5 - 4x^4 + 3x^3 + 5x^2 + 6 \), find \( f'''(x) \), the third derivative of \( f \), and \( f^{(4)}(x) \), the fourth derivative of \( f \). **Solution:** 1. **First Derivative, \( f'(x) \):** - Differentiate each term with respect to \( x \): - \( 3x^5 \) becomes \( 15x^4 \) - \( -4x^4 \) becomes \( -16x^3 \) - \( 3x^3 \) becomes \( 9x^2 \) - \( 5x^2 \) becomes \( 10x \) - \( 6 \) becomes \( 0 \) Thus, \[ f'(x) = 15x^4 - 16x^3 + 9x^2 + 10x \] 2. **Second Derivative, \( f''(x) \):** - Differentiate \( f'(x) \): - \( 15x^4 \) becomes \( 60x^3 \) - \( -16x^3 \) becomes \( -48x^2 \) - \( 9x^2 \) becomes \( 18x \) - \( 10x \) becomes \( 10 \) Thus, \[ f''(x) = 60x^3 - 48x^2 + 18x + 10 \] 3. **Third Derivative, \( f'''(x) \):** - Differentiate \( f''(x) \): - \( 60x^3 \) becomes \( 180x^2 \) - \( -48x^2 \) becomes \( -96x \) - \( 18x \) becomes \( 18 \) - \( 10 \) becomes \( 0 \) Thus, \[ f'''(x) = 180x^2 - 96x + 18 \]
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