%3D The slope of a tangent line to f(x) at x = a can be found using the formula lim fx) - f(a) X - a mtan In this situation, the function is f(x) and a = VE 36 36 %3D

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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The slope of a tangent line to \( f(x) \) at \( x = a \) can be found using the formula:

\[
m_{\text{tan}} = \lim_{{x \to a}} \frac{{f(x) - f(a)}}{{x - a}}
\]

In this situation, the function is \( f(x) = \sqrt{x} \) and \( a = 36 \).

**Part 2 of 4**

Therefore, we have:

\[
m_{\text{tan}} = \lim_{{x \to 36}} \frac{{\sqrt{x} - \sqrt{36}}}{{x - 36}}
\]

\[ 
= \lim_{{x \to 36}} \frac{{\sqrt{x} - 6}}{{x - 36}}
\]

**Part 3 of 4**

Using the factorization \( x - 36 = (\sqrt{x} - 6)(\sqrt{x} + 6) \), we have:

\[
m_{\text{tan}} = \lim_{{x \to 36}} \frac{{\sqrt{x} - 6}}{{(\sqrt{x} - 6)(\sqrt{x} + 6)}}
\]

\[
= \lim_{{x \to 36}} \frac{1}{{\sqrt{x} + 6}}
\]

A prompt asks the user to "Enter a fraction, integer, or exact decimal. Do not approximate."

This describes the process of finding the derivative of \( f(x) = \sqrt{x} \) at \( x = 36 \) using limits and simplifying the expression step-by-step.
Transcribed Image Text:The slope of a tangent line to \( f(x) \) at \( x = a \) can be found using the formula: \[ m_{\text{tan}} = \lim_{{x \to a}} \frac{{f(x) - f(a)}}{{x - a}} \] In this situation, the function is \( f(x) = \sqrt{x} \) and \( a = 36 \). **Part 2 of 4** Therefore, we have: \[ m_{\text{tan}} = \lim_{{x \to 36}} \frac{{\sqrt{x} - \sqrt{36}}}{{x - 36}} \] \[ = \lim_{{x \to 36}} \frac{{\sqrt{x} - 6}}{{x - 36}} \] **Part 3 of 4** Using the factorization \( x - 36 = (\sqrt{x} - 6)(\sqrt{x} + 6) \), we have: \[ m_{\text{tan}} = \lim_{{x \to 36}} \frac{{\sqrt{x} - 6}}{{(\sqrt{x} - 6)(\sqrt{x} + 6)}} \] \[ = \lim_{{x \to 36}} \frac{1}{{\sqrt{x} + 6}} \] A prompt asks the user to "Enter a fraction, integer, or exact decimal. Do not approximate." This describes the process of finding the derivative of \( f(x) = \sqrt{x} \) at \( x = 36 \) using limits and simplifying the expression step-by-step.
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