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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![Given the function \( r(x) = f(g(h(x))) \), where the following values are known:
- \( h(1) = 2 \)
- \( g(2) = 3 \)
- \( h'(1) = 5 \)
- \( g'(2) = 3 \)
- \( f'(3) = 6 \)
Calculate \( r'(1) \).
To solve this, apply the chain rule for derivatives to find \( r'(x) \), which involves differentiating \( f(g(h(x))) \).
First, find the derivative \( r'(x) = f'(g(h(x))) \cdot g'(h(x)) \cdot h'(x) \).
Substitute \( x = 1 \) and use the given values:
1. Since \( h(1) = 2 \), substitute \( h(1) \) in \( g \)'s derivative: \( g'(2) = 3 \).
2. Since \( g(2) = 3 \), substitute \( g(2) \) in \( f \)'s derivative: \( f'(3) = 6 \).
3. Use \( h'(1) = 5 \).
Combine these results to find:
\[ r'(1) = f'(3) \cdot g'(2) \cdot h'(1) = 6 \cdot 3 \cdot 5 = 90. \]
Thus, \( r'(1) = 90 \).](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fa9d90c29-7a50-478c-a57c-febbe49b4b5d%2Fa6143bbc-dcc9-42b0-9b00-f187b6add7c9%2Fw1qk4pi_processed.png&w=3840&q=75)
Transcribed Image Text:Given the function \( r(x) = f(g(h(x))) \), where the following values are known:
- \( h(1) = 2 \)
- \( g(2) = 3 \)
- \( h'(1) = 5 \)
- \( g'(2) = 3 \)
- \( f'(3) = 6 \)
Calculate \( r'(1) \).
To solve this, apply the chain rule for derivatives to find \( r'(x) \), which involves differentiating \( f(g(h(x))) \).
First, find the derivative \( r'(x) = f'(g(h(x))) \cdot g'(h(x)) \cdot h'(x) \).
Substitute \( x = 1 \) and use the given values:
1. Since \( h(1) = 2 \), substitute \( h(1) \) in \( g \)'s derivative: \( g'(2) = 3 \).
2. Since \( g(2) = 3 \), substitute \( g(2) \) in \( f \)'s derivative: \( f'(3) = 6 \).
3. Use \( h'(1) = 5 \).
Combine these results to find:
\[ r'(1) = f'(3) \cdot g'(2) \cdot h'(1) = 6 \cdot 3 \cdot 5 = 90. \]
Thus, \( r'(1) = 90 \).
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