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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
Transcribed Image Text:### Problem 50
**Question:**
The figure shows graphs of \( f \), \( f' \), \( f'' \), and \( f''' \). Identify each curve, and explain your choices.
**Solution:**
The given figure displays four different graphs labeled as \( a \), \( b \), \( c \), and \( d \), and we need to identify which one corresponds to the function \( f \), its first derivative \( f' \), its second derivative \( f'' \), and its third derivative \( f''' \).
- **Curve \( d \) (Black curve):**
This curve has inflection points and shows changes in concavity, indicating it is the original function \( f(x) \).
- **Curve \( c \) (Blue curve):**
This curve appears to have roots where the original function \( f(x) \) changes direction. These roots correspond to the critical points of \( f(x) \), suggesting that \( c \) is the first derivative \( f'(x) \). Where \( c \) crosses the x-axis, \( f \) has a maximum or minimum.
- **Curve \( b \) (Pink curve):**
This curve has roots corresponding to the critical points of the first derivative \( f'(x) \), implying that it is the second derivative \( f''(x) \). The points where \( b \) crosses the x-axis indicate where \( f \) has inflections.
- **Curve \( a \) (Green curve):**
Given the changes in the concavity of \( b \), \( a \) can be deduced as the third derivative \( f'''(x) \). The roots of \( a \) indicate inflection points of the second derivative \( f''(x) \).
**Explanation:**
- The original function \( f(x) \) (black curve) will have inflection points where the second derivative \( f''(x) \) (pink curve) crosses the x-axis.
- The first derivative \( f'(x) \) (blue curve) will intersect the x-axis at points where \( f(x) \) has local maxima and minima.
- The second derivative \( f''(x) \) (pink curve) will intersect the x-axis at the inflection points of \( f(x) \), indicating changes in concavity.
- The third derivative \( f'''(x)
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