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Let \(x=1\) and \(\Delta x=0.01\). Find \(\Delta y\). \(f(x)=\frac{4}{\sqrt[3]{x}}\)

Short Answer

Expert verified
\(\Delta y\) is given by \(\frac{4}{\sqrt[3]{1.01}} - 4\).

Step by step solution

01

Calculate \(f(x)\) and \(f(x + \Delta x)\)

Firstly, compute the function values \(f(x)\) and \(f(x + \Delta x)\). Here, \(x=1\) and \(\Delta x=0.01\). So, plug these values into the function \(f(x) = \frac{4}{\sqrt[3]{x}}\). We get1. \(f(x) = \frac{4}{\sqrt[3]{1}} = 4\)2. \(f(x + \Delta x) = \frac{4}{\sqrt[3]{1.01}}\)
02

Calculate \(\Delta y\)

Now compute \(\Delta y\) by applying the formula \(\Delta y = f(x + \Delta x) - f(x)\). As calculated in step 1,\(\Delta y = \frac{4}{\sqrt[3]{1.01}} - 4\)

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Key Concepts

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

Function Evaluation
Function evaluation refers to the process of computing the output of a given function for specific input values. In this exercise, we have the function \( f(x) = \frac{4}{\sqrt[3]{x}} \). At \( x = 1 \), we evaluate the function to find \( f(1) \), which simplifies to:
  • Since \( \sqrt[3]{1} = 1 \), the expression becomes \( \frac{4}{1} = 4 \).
Function evaluation is fundamental in calculus as it provides specific values that help in understanding the behavior of functions over different ranges. Here, calculating the next function value \( f(x + \Delta x) \), where \( \Delta x = 0.01 \) and \( x = 1 \), requires plugging these into the function:
  • Calculate \( \sqrt[3]{1.01} \), then divide 4 by this result to get \( f(1.01) \).
These steps demonstrate how small changes in \( x \) can affect the output, which is crucial when analyzing functions and their responsiveness to input changes.
Change in Variables
Change in variables involves understanding how a small change in the input, such as \( \Delta x \), influences the change in the output, represented as \( \Delta y \). This concept is central in differential calculus for analyzing how functions react to small variations. Use this method to approximate how the function behaves as its input changes slightly from its original value.In our problem:
  • \( x = 1 \) changes to \( x + \Delta x = 1.01 \).
  • Calculate \( f(x+\Delta x) - f(x) \) to determine \( \Delta y \), the change in the function's value, illustrating the change in variables concept.
    • Understanding these shifts allows students to grasp how the derivative, a principle in calculus, is determined. It essentially measures slopes of tangent lines at once value of \( x \), helping to predict behavior in nearby segments.
Calculus Problems
Calculus problems often involve determining how functions change and are evaluated at specific points. Calculus, especially differential calculus, focuses on rates of change which includes examining how one quantity changes concerning another. In typical calculus problems, such as the provided exercise, you observe how slight modifications in \( x \) (the independent variable) affect \( y \) (the dependent variable).For the function \( f(x) = \frac{4}{\sqrt[3]{x}} \) here:
  • Given \( \Delta x = 0.01 \), find \( \Delta y \) using \( \Delta y = f(x+ \Delta x) - f(x) \).
This introduces learners to thinking critically about what these solutions mean in broader terms. Calculus problems teach the skills needed to infer insights about the nature of changes leading to advanced topics like integration, which considers accumulating those changes over an interval. This foundational understanding helps tackle real-world problems that involve dynamic change across different fields, such as physics or engineering.

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Most popular questions from this chapter

The variable cost for the production of a calculator is \(\$ 14.25\) and the initial investment is \(\$ 110,000\). Find the total cost \(C\) as a function of \(x\), the number of units produced. Then use differentials to approximate the change in the cost for a one-unit increase in production when \(x=50,000\). Make a sketch showing \(d C\) and \(\Delta C\). Explain why \(d C=\Delta C\) in this problem.

Let \(x=1\) and \(\Delta x=0.01\). Find \(\Delta y\). \(f(x)=\sqrt{3 x}\)

The cost function for a certain model of personal digital assistant (PDA) is given by \(C=13.50 x+45,750\), where \(C\) is measured in dollars and \(x\) is the number of PDAs produced. (a) Find the average cost function \(\bar{C}\). (b) Find \(\bar{C}\) when \(x=100\) and \(x=1000\). (c) Determine the limit of the average cost function as \(x\) approaches infinity. Interpret the limit in the context of the problem.

The table lists the average monthly Social Security benefits \(B\) (in dollars) for retired workers aged 62 and over from 1998 through 2005 . A model for the data is \(B=\frac{582.6+38.38 t}{1+0.025 t-0.0009 t^{2}}, \quad 8 \leq t \leq 15\) where \(t=8\) corresponds to 1998 . $$ \begin{array}{|l|l|l|l|l|l|l|l|l|} \hline t & 8 & 9 & 10 & 11 & 12 & 13 & 14 & 15 \\ \hline B & 780 & 804 & 844 & 874 & 895 & 922 & 955 & 1002 \\ \hline \end{array} $$ (a) Use a graphing utility to create a scatter plot of the data and graph the model in the same viewing window. How well does the model fit the data? (b) Use the model to predict the average monthly benefit in \(2008 .\) (c) Should this model be used to predict the average monthly Social Security benefits in future years? Why or why not?

Determine whether the statement is true or false. If it is false, explain why or give an example that shows it is false. If \(y=a x+b\), then \(\Delta y / \Delta x=d y / d x\)

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