5* – 1 - Find the limit lim 2x

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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To solve the limit problem, we need to evaluate the following expression:

\[ \lim_{{x \to 0}} \frac{5^x - 1}{2x} \]

Here’s a step-by-step explanation on how to approach this problem:

1. **Direct Substitution**: 
   Initially, you might think to substitute \( x = 0 \) directly into the expression. However, doing so results in the indeterminate form \(\frac{0}{0}\). Therefore, direct substitution doesn't work in this case and alternative methods should be considered.

2. **Applying L'Hôpital's Rule**:
   When faced with an indeterminate form such as \(\frac{0}{0}\), L'Hôpital's Rule can be used. L'Hôpital's Rule states that if \(\lim_{{x \to c}} f(x)/g(x) = 0/0\) or \(\pm \infty/\pm \infty\), then:
   \[
   \lim_{{x \to c}} \frac{f(x)}{g(x)} = \lim_{{x \to c}} \frac{f'(x)}{g'(x)}
   \]
   provided that the limit on the right-hand side exists.

3. **Differentiate the Numerator and Denominator**:
   The numerator \( 5^x - 1 \) and the denominator \( 2x \) need to be differentiated separately:
   
   - The derivative of \( 5^x \) is: \( 5^x \ln 5 \)
   - The derivative of \( -1 \) is: \( 0 \)
   - The derivative of \( 2x \) is: \( 2 \)

4. **Substitute the Derivatives**:
   Applying L'Hôpital's Rule:
   \[
   \lim_{{x \to 0}} \frac{5^x - 1}{2x} = \lim_{{x \to 0}} \frac{5^x \ln 5}{2}
   \]

5. **Evaluate the Limit**:
   Now, substituting \( x = 0 \) into \(\frac{5^x \ln 5}{2}\) gives:
   \[
   \frac{5^0 \ln 5}{2} = \frac{1 \cd
Transcribed Image Text:To solve the limit problem, we need to evaluate the following expression: \[ \lim_{{x \to 0}} \frac{5^x - 1}{2x} \] Here’s a step-by-step explanation on how to approach this problem: 1. **Direct Substitution**: Initially, you might think to substitute \( x = 0 \) directly into the expression. However, doing so results in the indeterminate form \(\frac{0}{0}\). Therefore, direct substitution doesn't work in this case and alternative methods should be considered. 2. **Applying L'Hôpital's Rule**: When faced with an indeterminate form such as \(\frac{0}{0}\), L'Hôpital's Rule can be used. L'Hôpital's Rule states that if \(\lim_{{x \to c}} f(x)/g(x) = 0/0\) or \(\pm \infty/\pm \infty\), then: \[ \lim_{{x \to c}} \frac{f(x)}{g(x)} = \lim_{{x \to c}} \frac{f'(x)}{g'(x)} \] provided that the limit on the right-hand side exists. 3. **Differentiate the Numerator and Denominator**: The numerator \( 5^x - 1 \) and the denominator \( 2x \) need to be differentiated separately: - The derivative of \( 5^x \) is: \( 5^x \ln 5 \) - The derivative of \( -1 \) is: \( 0 \) - The derivative of \( 2x \) is: \( 2 \) 4. **Substitute the Derivatives**: Applying L'Hôpital's Rule: \[ \lim_{{x \to 0}} \frac{5^x - 1}{2x} = \lim_{{x \to 0}} \frac{5^x \ln 5}{2} \] 5. **Evaluate the Limit**: Now, substituting \( x = 0 \) into \(\frac{5^x \ln 5}{2}\) gives: \[ \frac{5^0 \ln 5}{2} = \frac{1 \cd
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