/*! 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 127 In Exercises \(125-132,\) use yo... [FREE SOLUTION] | 91Ó°ÊÓ

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In Exercises \(125-132,\) use your graphing utility to graph each side of the equation in the same viewing rectangle. Then use the \(x\) -coordinate of the intersection point to find the equation's solution set. Verify this value by direct substitution into the equation. $$\log _{3}(4 x-7)=2$$

Short Answer

Expert verified
The solution to the equation is \(x = 4\).

Step by step solution

01

Convert the Logarithmic Equation to Exponential Form

According to the law of logarithms, a logarithm equation \(\log _{b}a = c\) can be expressed in the form \(b^c = a\). Applying this rule to the given equation \(\log _{3}(4x-7)=2\), we convert it to the form \(3^2 = 4x-7\).
02

Simplify the Equation

We simplify the resulting equation to get the value of 'x'. The equation \(3^2 = 4x - 7\) becomes \(9 = 4x - 7\). To solve for 'x', we first need to isolate 'x' to one side. We will do this by adding 7 to both sides of the equation. This leads to the new equation \(16 = 4x\).
03

Solve for 'x'

Now we want to get 'x' by itself, we will do this by dividing each side of the equation by 4. So, the equation \(16 = 4x\) becomes \(x = 4\). This is the solution to the original equation.
04

Verification

We can verify our result by substituting the value of 'x' into the original equation. Substituting 'x' = 4 into the equation \(\log _{3}(4x - 7) = 2\) becomes \(\log _{3}(4 * 4 - 7) = 2\), which simplifies further to \(\log _{3}(9) = 2\). Given that the logarithm base 3 of 9 is indeed 2, our solution for 'x' is correct.

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Key Concepts

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

Logarithm to Exponential Form
Understanding how to convert a logarithmic equation to its exponential form is crucial in finding the solution to many algebra problems. Let's take the logarithmic equation \(\log_{3}(4x-7)=2\). This equation tells us that the power to which 3 must be raised to obtain \(4x-7\) is 2. To convert this to exponential form, we use the fundamental logarithmic identity \(b^{\log_{b}(x)} = x\). Hence, the given logarithm \(\log_{3}(4x-7)=2\) can be rewritten as \(3^2 = 4x - 7\).

Now that we've transformed the equation, it simplifies the process of solving for \(x\). The exponential form clearly displays how \(3\), raised to the power of 2, equals \(4x - 7\). By converting logarithms to exponential form, we can more easily manipulate the equation and isolate the variable we're solving for.
Graphing Utility
When it comes to visualizing the solutions for equations, a graphing utility can be exceptionally helpful, especially when dealing with functions like logarithms. By graphing both sides of the equation in the same viewing rectangle, we can look for points of intersection which represent the solutions to the equation. For the given exercise, plotting \(y = \log_{3}(4x-7)\) and \(y = 2\) on the graph and finding their intersection gives us a visual confirmation of the solution.

Graphing also has the added benefit of showing us the behavior of the logarithmic function around the solution, which can provide insights into the nature of the solution set. For instance, if the intersection point is at the corner of a curve, it may indicate that there is only one solution. By using a graphing utility, we gain another method to solve and analyze logarithmic equations, complementing the algebraic approach.
Equation Verification
After solving a logarithmic equation, verifying the solution is a critical step to ensure accuracy. Verification involves substituting the obtained value back into the original equation to confirm it makes both sides equal. In our case, the proposed solution is \(x = 4\).

We can verify this by substituting it back into the original equation \(\log_{3}(4x-7) = 2\): when \(x\) is replaced with 4, we get \(\log_{3}(4\times4-7)\), which simplifies to \(\log_{3}(9)\). Knowing the properties of logarithms, specifically that \(\log_{b}(b^c) = c\), we can see that \(\log_{3}(3^2)\) indeed equals 2. This confirms that our solution \(x = 4\) is correct. Verification is a guarantee that the solution is not a result of a careless error and solidifies our understanding of the concepts at play.

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Most popular questions from this chapter

Exercises \(153-155\) will help you prepare for the material covered in the next section. U.S. soldiers fight Russian troops who have invaded New York City. Incoming missiles from Russian submarines and warships ravage the Manhattan skyline. It's just another scenario for the multi-billion-dollar video games Call of Duty, which have sold more than 100 million games since the franchise's birth in 2003 The table shows the annual retail sales for Call of Duty video games from 2004 through 2010 . Create a scatter plot for the data. Based on the shape of the scatter plot, would a logarithmic function, an exponential function, or a linear function be the best choice for modeling the data? $$\begin{array}{cc} \hline \text { Year } & \begin{array}{c} \text { Retail Sales } \\ \text { (millions of dollars) } \end{array} \\ \hline 2004 & 56 \\ 2005 & 101 \\ 2006 & 196 \\ 2007 & 352 \\ 2008 & 436 \\ 2009 & 778 \\ 2010 & 980 \end{array}$$

Determine whether each statement makes sense or does not make sense, and explain your reasoning. After 100 years, a population whose growth rate is \(3 \%\) will have three times as many people as a population whose growth rate is \(1 \%\)

Determine whether each statement makes sense or does not make sense, and explain your reasoning. I'm using a photocopier to reduce an image over and over by \(50 \%,\) so the exponential function \(f(x)=\left(\frac{1}{2}\right)^{x}\) models the new image size, where \(x\) is the number of reductions.

a. Evaluate: \(\log _{2} 16\) b. Evaluate: \(\log _{2} 32-\log _{2} 2\) c. What can you conclude about \(\log _{2} 16,\) or \(\log _{2}\left(\frac{32}{2}\right) ?\)

Use a calculator with \(a\left[y^{x}\right]\) key or \(a \square\) key to solve. India is currently one of the world's fastest-growing countries. By \(2040,\) the population of India will be larger than the population of China; by \(2050,\) nearly one-third of the world's population will live in these two countries alone. The exponential function \(f(x)=574(1.026)^{x}\) models the population of India, \(f(x),\) in millions, \(x\) years after 1974 a. Substitute 0 for \(x\) and, without using a calculator, find India's population in 1974 b. Substitute 27 for \(x\) and use your calculator to find India's population, to the nearest million, in the year 2001 as modeled by this function. c. Find India's population, to the nearest million, in the year 2028 as predicted by this function. d. Find India's population, to the nearest million, in the year 2055 as predicted by this function. e. What appears to be happening to India's population every 27 years?

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