/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} Problem 71 a. Find the critical points of t... [FREE SOLUTION] | 91Ó°ÊÓ

91Ó°ÊÓ

a. Find the critical points of the following functions on the given interval. b. Use a graphing utility to determine whether the critical points correspond to local maxima, local minima, or neither. c. Find the absolute maximum and minimum values on the given interval when they exist. $$g(x)=(x-3)^{5 / 3}(x+2) \text { on }[-4,4]$$

Short Answer

Expert verified
Answer: The absolute maximum value is 6 at \(x=4\) and the absolute minimum value is 0 at \(x=3\).

Step by step solution

01

Calculate the derivative of the given function

To find the critical points, we need to calculate the first derivative of the given function: $$g(x) = (x - 3)^{\frac{5}{3}}(x + 2)$$ Use the Product Rule to differentiate this function: $$g'(x) = \frac{d}{dx}\left[(x - 3)^{\frac{5}{3}}\right] (x + 2) + (x - 3)^{\frac{5}{3}}\frac{d}{dx}\left[(x + 2)\right]$$ Differentiate each part: $$g'(x) = \frac{5}{3}(x - 3)^{\frac{2}{3}} (x + 2) + (x - 3)^{\frac{5}{3}}$$
02

Find the critical points

To find the critical points, set the derivative equal to zero and solve for x: $$0 = \frac{5}{3}(x - 3)^{\frac{2}{3}} (x + 2) + (x - 3)^{\frac{5}{3}}$$ We can simplify this equation by factoring \((x - 3)^{\frac{2}{3}}\): $$(x - 3)^{\frac{2}{3}}\left[\frac{5}{3}(x + 2) + (x - 3)\right] = 0$$ This implies that either \((x - 3)^{\frac{2}{3}} = 0\) or \(\frac{5}{3}(x + 2) + (x - 3) = 0\). The first equation, \((x - 3)^{\frac{2}{3}} = 0\), has one solution: \(x = 3\). The second equation, \(\frac{5}{3}(x + 2) + (x - 3) = 0\), simplifies to \(x = -\frac{13}{3}\), which is not in the interval \([-4, 4]\). So we only have one critical point, \(x = 3\).
03

Validate the critical points using a graphing utility

We can use a graphing utility to confirm that \(x=3\) is the only critical point in the given interval. After graphing the function, it is clear that \(x=3\) is the only point in the interval where the function's tangent line is horizontal.
04

Use the second derivative test to classify the critical points

The second derivative test is inconclusive for this function because the second derivative is not continuous in the domain. Therefore, we cannot classify the critical point using this method.
05

Determine the absolute maximum and minimum values

To find the absolute maximum and minimum values, we need to evaluate the function at the critical point and at the interval endpoints: $$g(-4) = (-1)^{\frac{5}{3}}(-2) = 2$$ $$g(3) = (0)^{\frac{5}{3}}(5) = 0$$ $$g(4) = (1)^{\frac{5}{3}}(6) = 6$$ On the interval \([-4, 4]\), the absolute maximum value is 6 at \(x=4\) and the absolute minimum value is 0 at \(x=3\).

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Over 30 million students worldwide already upgrade their learning with 91Ó°ÊÓ!

Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Understanding Derivatives
The concept of a derivative is fundamental in calculus. It represents the rate at which a function changes at any given point. In simpler terms, it's the function's slope at a particular point. The derivative tells us how the function's output changes as its input changes.
To find the derivative of a function, such as \[g(x) = (x - 3)^{\frac{5}{3}}(x + 2)\], we typically use rules like the Power Rule or the Product Rule, which are designed to make the process easier. Think of the derivative as a mathematical tool that helps us analyze the behavior of functions. It's crucial in understanding how changes in one variable affect another.
In this problem, the derivative \( g'(x) \) was found using the Product Rule, which simplifies the differentiation process when dealing with products of functions. Knowing how to calculate and apply derivatives is essential in discovering more about the function's local behavior, such as identifying critical points where maximums or minimums may occur.
Utilizing the Product Rule
The Product Rule is a valuable technique in calculus for finding the derivative of a product of two functions. It states that if you have a function \( g(x) \) expressed as a product of two functions, each with their own variable dependence, you can find the derivative by differentiating each function separately.
To apply the Product Rule:
  • Differentiate the first function while keeping the second function constant.
  • Switch roles by keeping the first function constant while differentiating the second function.
  • Add the results together.
In our exercise, we have \( g(x) = (x - 3)^{\frac{5}{3}}(x + 2) \). Using the Product Rule: \[ g'(x) = \frac{d}{dx}[(x - 3)^{\frac{5}{3}}] \cdot (x + 2) + (x - 3)^{\frac{5}{3}} \cdot \frac{d}{dx}[(x + 2)] \].
By applying these steps, you can accurately compute the derivative, allowing for further analysis, like finding critical points. Understanding and applying the Product Rule is instrumental in solving many problems involving derivatives of products.
Performing Interval Analysis
Interval analysis allows us to take a broader view of the behavior of functions within a specific range of x-values. It involves examining the function on an interval, which helps in understanding how the function behaves between specific values.
In the presented problem, interval analysis is applied to find critical points and determine whether there are any maximum or minimum values within the interval In this problem, the provided interval is \([-4, 4]\), and we aim to find critical points where the derivative equals zero and check the function's behavior at these points. When analyzing our function over this interval, we consider these aspects:
  • The critical point where the derivative equals zero, providing potential local extrema.
  • The endpoints of the interval to ensure potential maximum or minimum values aren't missing.
This method gives us complete insight into how the function behaves over our range of interest. It helps us find where the function reaches its highest and lowest values, both crucial for comprehensive function analysis.
Identifying Maximum and Minimum Values
Finding the maximum and minimum values of a function involves pinpointing where the function achieves its highest and lowest outputs. These values are significant as they provide crucial information about the function's range and behavior.
The process typically involves examining critical points—where the function's derivative is zero or undefined—and also evaluating the function at the boundaries or endpoints of our interval. For our function \( g(x) = (x-3)^{\frac{5}{3}}(x+2) \) on \([-4, 4]\):
  • We found the critical point at \( x=3 \) by setting the derivative \( g'(x) = 0 \).
  • The function's value is calculated at endpoints \( x=-4 \) and \( x=4 \), as well as at the critical point.
Through this, we confirmed that an absolute minimum occurs at \( x=3 \) with \( g(3) = 0 \), and an absolute maximum occurs at \( x=4 \) with \( g(4) = 6 \).
The identification of these values teaches us not only about the behavior of this specific function but showcases methods applicable to a wide range of calculus problems.

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

The complexity of a computer algorithm is the number of operations or steps the algorithm needs to complete its task assuming there are \(n\) pieces of input (for example, the number of steps needed to put \(n\) numbers in ascending order). Four algorithms for doing the same task have complexities of A: \(n^{3 / 2}, B: n \log _{2} n, C: n\left(\log _{2} n\right)^{2},\) and \(D: \sqrt{n} \log _{2} n .\) Rank the algorithms in order of increasing efficiency for large values of \(n\) Graph the complexities as they vary with \(n\) and comment on your observations.

Sketch the graph of a function that is continuous on \((-\infty, \infty)\) and satisfies the following sets of conditions. $$\begin{aligned} &f^{\prime \prime}(x)>0 \text { on }(-\infty,-2) ; f^{\prime \prime}(-2)=0 ; f^{\prime}(-1)=f^{\prime}(1)=0\\\ &f^{\prime \prime}(2)=0 ; f^{\prime}(3)=0 ; f^{\prime \prime}(x)>0 \text { on }(4, \infty) \end{aligned}$$

Is it possible? Determine whether the following properties can be satisfied by a function that is continuous on \((-\infty, \infty)\). If such a function is possible, provide an example or a sketch of the function. If such a function is not possible, explain why. a. A function \(f\) is concave down and positive everywhere. b. A function \(f\) is increasing and concave down everywhere. c. A function \(f\) has exactly two local extrema and three inflection points. d. A function \(f\) has exactly four zeros and two local extrema.

Given the following acceleration functions of an object moving along a line, find the position function with the given initial velocity and position. $$a(t)=3 \sin 2 t ; v(0)=1, s(0)=10$$

Locate the critical points of the following functions and use the Second Derivative Test to determine (if possible) whether they correspond to local maxima or local minima. $$h(x)=(x+a)^{4} ; a \text { constant }$$

See all solutions

Recommended explanations on Math Textbooks

View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.