/*! 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 88 (a) use a graphing utility to gr... [FREE SOLUTION] | 91Ó°ÊÓ

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(a) use a graphing utility to graph the two equations in the same viewing window and (b) use the table feature of the graphing utility to create a table of values for each equation. (c) What do the graphs and tables suggest? Verify your conclusion algebraically.$$y_{1}=\frac{1}{2} \ln x-\ln (x+2), \quad y_{2}=\ln \left(\frac{\sqrt{x}}{x+2}\right)$$

Short Answer

Expert verified
The graphs of the two functions and the tables of values suggest that the functions have identical values over a specific range of x-values. This is verified algebraically by setting the two equations equal to each other and solving for x, which should yield the same results as were observed graphically.

Step by step solution

01

Graph the Functions

Use an online graphing utility like Desmos or a graphing calculator to plot both \(y_{1}=\frac{1}{2} \ln x-\ln (x+2)\) and \(y_{2}=\ln \left(\frac{\sqrt{x}}{x+2}\right)\). Adjust the viewing window as necessary to ensure both graphs are visible.
02

Create a Table of Values

Next, use the table feature of the graphing utility to generate a table of values for each function. For each function, input a variety of x-values and record the resulting y-values. Make sure to use a range of x-values that includes both positive and negative numbers to get a full understanding of the behavior of the functions.
03

Analyze the Graphs and Tables

Observe the graphs and the table of values to identify any trends or patterns. Notice how the two functions behave as x increases and decreases, and look for any intersection points between the two graphs.
04

Verify Conclusions Algebraically

To verify the conclusions algebraically, set the two equations equal to each other and solve for x. That is, solve \(\frac{1}{2} \ln x-\ln (x+2) = \ln \left(\frac{\sqrt{x}}{x+2}\right)\) for \(x\). If the solution for \(x\) matches the intersecting points observed in the graphs, then your graphical conclusions are verified.

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Key Concepts

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

Logarithmic Equations
Understanding logarithmic equations is fundamental when it comes to graphing logarithmic functions. A logarithmic equation contains a logarithm with a variable inside its input argument. Solving these equations typically involves using properties of logarithms, such as the product, quotient, and power rules.

For example, in the exercise provided, we have two equations:
\begin{itemize}\begin{itemize}\begin{itemize}\begin{itemize}\begin{itemize}\begin{itemize}\begin{itemize}\item \(y_1 = \frac{1}{2} \ln(x) - \ln(x+2)\)\begin{itemize}\item \(y_2 = \ln\left(\frac{\sqrt{x}}{x+2}\right)\)\begin{itemize}\begin{itemize}\item To solve for \(x\) when these equations are set equal to one another, we must use the properties of logarithms to combine and simplify the terms. This algebraic manipulation will allow us to find the values of \(x\) where the graphs of \(y_1\) and \(y_2\) intersect.
Graphing Utilities
Graphing utilities, such as Desmos or graphing calculators, are incredibly valuable tools for visualizing mathematical equations. These utilities let you quickly and accurately plot the behavior of complex functions like logarithms. When graphing the two logarithmic equations in the exercise, it’s important to adjust the viewing window to ensure that all relevant parts of the graph are visible.

Moreover, when using these tools, you can easily compare the two functions by observing their intersections and behavior across different scales. This visual assessment provides an intuitive understanding of the functions' relationship to each other.
Tables of Values
Tables of values are another method to understand functions and are especially useful when paired with graphical analysis. By inputting a range of x-values into a function, you can observe how the output y-values behave. These tables give you a numeric view of the function’s behavior at specific points.

It's crucial to choose x-values that are within the domain of the logarithmic functions to avoid undefined values. In our exercise, since logarithms are undefined for non-positive values, the table should start with positive x-values, and it should include values around the points where the graphs potentially intersect to confirm these points numerically.
Algebraic Verification
Finally, algebraic verification is the process of proving your graphical observations through mathematical reasoning. After visually identifying an intersection point on the graph, you can prove that such a point exists by algebraically setting the equations equal and finding the x-value that satisfies both.

For instance, to algebraically verify the solutions of the logarithmic equations provided, set \(\frac{1}{2} \ln(x) - \ln(x+2)\) equal to \(\ln\left(\frac{\sqrt{x}}{x+2}\right)\) and solve for x. If the solution matches the intersection points observed in the graphical representation, you've confirmed the accuracy of your graphical findings.

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Most popular questions from this chapter

Let \(f(x)=\log _{a} x\) and \(g(x)=a^{x},\) where \(a>1.\) (a) Let \(a=1.2\) and use a graphing utility to graph the two functions in the same viewing window. What do you observe? Approximate any points of intersection of the two graphs. (b) Determine the value(s) of \(a\) for which the two graphs have one point of intersection. (c) Determine the value(s) of \(a\) for which the two graphs have two points of intersection.

Solve the logarithmic equation algebraically. Round the result to three decimal places. Verify your answer(s) using a graphing utility. $$\log _{10} 8 x-\log _{10}(1+\sqrt{x})=2$$

The table shows the annual sales \(S\) (in billions of dollars) of Starbucks for the years from 2009 through 2013. (Source: Starbucks Corp.) $$\begin{array}{|c|c|}\hline \text { Year } & \text { Sales, } S \\\\\hline 2009 & 9.77 \\\\\hline 2010 & 10.71 \\\\\hline 2011 & 11.70 \\\\\hline 2012 & 13.30 \\\\\hline 2013 & 14.89 \\\\\hline\end{array}$$ (a) Use the regression feature of a graphing utility to find an exponential model for the data. Let \(t\) represent the year, with \(t=9\) corresponding to 2009. (b) Rewrite the model from part (a) as a natural exponential model. (c) Use the natural exponential model to predict the annual sales of Starbucks in \(2018 .\) Is the value reasonable?

The yield \(V\) (in millions of cubic feet per acre) for a forest at age \(t\) years is given by \(V=6.7 e^{-48.1 / t}\) (a) Use a graphing utility to graph the function. (b) Determine the horizontal asymptote of the function. Interpret its meaning in the context of the problem. (c) Find the time necessary to obtain a yield of 1.3 million cubic feet.

Use the regression feature of a graphing utility to find a power model \(y=a x^{b}\) for the data and identify the coefficient of determination. Use the graphing utility to plot the data and graph the model in the same viewing window. $$(1,2.0),(2,3.4),(5,6.7),(6,7.3),(10,12.0)$$

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