-6 4 6. 8 a) O f(x) is decreasing on the interval (-4, o0). b) O f(x) is decreasing on the intervals (-0o, -4) and (1, 7). c) O f(x) is decreasing on the intervals (-4, 1) and (7, 0). d) O f(x) is decreasing on the interval (-4, 7). e) O f(x) is decreasing on the interval (-0, 7).

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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**Identifying Decreasing Intervals of a Function**

**Problem Statement:**

Given the graph of \( f'(x) \), determine where \( f(x) \) is decreasing.

---

**Graph Analysis:**

The graph depicts the derivative \( f'(x) \). The curve crosses the x-axis at points approximately at \( x = -4 \) and \( x = 7 \). The function is negative between these intercepts, specifically on the intervals \( (-\infty, -4) \) and \( (1, 7) \).

**Answer Choices:**

a) \( f(x) \) is decreasing on the interval \((-4, \infty)\).

b) \( f(x) \) is decreasing on the intervals \((-∞, -4)\) and \((1, 7)\). [This is the correct option and is highlighted in blue.]

c) \( f(x) \) is decreasing on the intervals \((-4, 1)\) and \((7, \infty)\).

**Conclusion:**

The correct answer is option b), where \( f(x) \) is decreasing on the intervals where \( f'(x) \) is negative: \((-∞, -4)\) and \((1, 7)\).
Transcribed Image Text:**Identifying Decreasing Intervals of a Function** **Problem Statement:** Given the graph of \( f'(x) \), determine where \( f(x) \) is decreasing. --- **Graph Analysis:** The graph depicts the derivative \( f'(x) \). The curve crosses the x-axis at points approximately at \( x = -4 \) and \( x = 7 \). The function is negative between these intercepts, specifically on the intervals \( (-\infty, -4) \) and \( (1, 7) \). **Answer Choices:** a) \( f(x) \) is decreasing on the interval \((-4, \infty)\). b) \( f(x) \) is decreasing on the intervals \((-∞, -4)\) and \((1, 7)\). [This is the correct option and is highlighted in blue.] c) \( f(x) \) is decreasing on the intervals \((-4, 1)\) and \((7, \infty)\). **Conclusion:** The correct answer is option b), where \( f(x) \) is decreasing on the intervals where \( f'(x) \) is negative: \((-∞, -4)\) and \((1, 7)\).
The image presents a graph of a function \( f(x) \) and several options regarding intervals where the function is decreasing. The graph displays one cycle of the function, with specific intervals of increase and decrease visually represented by peaks and troughs.

**Options:**

a) \( f(x) \) is decreasing on the interval \( (-4, \infty) \).

b) \( f(x) \) is decreasing on the intervals \( (-\infty, -4) \) and \( (1, 7) \).

c) \( f(x) \) is decreasing on the intervals \( (-4, 1) \) and \( (7, \infty) \).

d) \( f(x) \) is decreasing on the interval \( (-4, 7) \).

e) \( f(x) \) is decreasing on the interval \( (-\infty, 7) \).

Option b is selected as the correct choice, indicating that the function is decreasing on the intervals \( (-\infty, -4) \) and \( (1, 7) \). These intervals correspond to portions of the graph where the function is moving downward as \( x \) increases.
Transcribed Image Text:The image presents a graph of a function \( f(x) \) and several options regarding intervals where the function is decreasing. The graph displays one cycle of the function, with specific intervals of increase and decrease visually represented by peaks and troughs. **Options:** a) \( f(x) \) is decreasing on the interval \( (-4, \infty) \). b) \( f(x) \) is decreasing on the intervals \( (-\infty, -4) \) and \( (1, 7) \). c) \( f(x) \) is decreasing on the intervals \( (-4, 1) \) and \( (7, \infty) \). d) \( f(x) \) is decreasing on the interval \( (-4, 7) \). e) \( f(x) \) is decreasing on the interval \( (-\infty, 7) \). Option b is selected as the correct choice, indicating that the function is decreasing on the intervals \( (-\infty, -4) \) and \( (1, 7) \). These intervals correspond to portions of the graph where the function is moving downward as \( x \) increases.
Expert Solution
Concept

When f'(x)>0, then f(x) is increasing.When f'(x)<0, then f(x) is decreasing.

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