/*! 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 132 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. $$5^{x}=3 x+4$$

Short Answer

Expert verified
The solution to this equation would be the x-coordinate (a) of the intersection point of the two functions \(y = 5^x\) and \(y = 3x + 4\), subject to verification by direct substitution into the original equation.

Step by step solution

01

Graph the Functions

Using your graphing utility, graph the function \(y = 5^x\) and the function \(y = 3x + 4\) on the same viewing rectangle. Note the x-coordinate of the intersection point.
02

Identify the x-coordinate of the intersection point

Identify the x-coordinate of the point where the two graphs intersect. Let's say this x-coordinate is \(a\) (for the sake of providing an example).
03

Verify the Solution

Substitute \(x = a\) back into the original equation, \(5^x = 3x + 4,\) to verify the solution.

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Key Concepts

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

Graphical Solution of Equations
Understanding how to solve equations graphically is a fundamental skill in algebra. This approach involves plotting the expressions on either side of the equation as separate functions on a graph, and then identifying where these functions intersect. The intersection points reveal the values that satisfy both expressions, thus solving the equation.

For instance, when we graph the function given by the exponential equation, such as \(y = 5^x\), on the same set of axes as the linear function, \(y = 3x + 4\), we create a visual representation of the solutions. The x-coordinate(s) where the graphs intersect correspond to the solution(s) of the equation \(5^x = 3x + 4\). Verifying the solutions with direct substitution ensures accuracy. This method is particularly helpful when dealing with equations that are difficult to solve algebraically. Graphing utilities like calculators or software can assist in accurately plotting these functions for better visualization and to find solutions more easily.
Exponential Functions
Exponential functions are a type of mathematical expression where a constant base is raised to a variable exponent. The general form of an exponential function is \(y = a^x\), where \(a\) represents the base and \(x\) the exponent. These functions are known for their rapid growth or decay, depending on the base value.

In the context of our problem, the function \(5^x\) is exponential with a base of 5. This means as x increases, the value of \(5^x\) grows very quickly. Understanding the nature of exponential growth is crucial in graphing these functions, as the curve will start off relatively flat but then spike upward as x increases. Recognizing this pattern helps anticipate the shape of the graph and determine an appropriate viewing window on a graphing utility to find where it intersects with other functions, such as linear equations.
System of Equations Graphing
Graphing a system of equations involves plotting two or more equations on the same graph and finding their point(s) of intersection. The solutions to the system are the coordinates of these intersection points. When dealing with a system that includes an exponential function and a linear equation, the process begins with selecting an appropriate viewing rectangle that fits both graph types.

For a linear equation, such as \(y = 3x + 4\), the graph is a straight line and is relatively simple to plot. However, for the exponential equation, selecting a window that captures the rapid increase of the function without losing detail is key. After plotting both functions using a graphing utility and observing the intersection points, you can then identify the solutions to the system. This graphically intuitive method provides a visual and tangible means for solving complex systems that might be difficult or time-consuming to solve by algebraic methods alone.

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Most popular questions from this chapter

$$\text { Solve for } y: 7 x+3 y=18$$

Hurricanes are one of nature's most destructive forces. These low-pressure areas often have diameters of over 500 miles. The function \(f(x)=0.48 \ln (x+1)+27\) models the barometric air pressure, \(f(x),\) in inches of mercury, at a distance of \(x\) miles from the eye of a hurricane. Use this function to solve Exercises \(133-134\) Use an equation to answer this question: How far from the eye of a hurricane is the barometric air pressure 29 inches of mercury? Use the \([\text { TRACE }]\) and \(\overline{\mathbf{Z O O M}}\) features or the intersect command of your graphing utility to verify your answer.

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?

Rewrite the equation in terms of base \(e\). Express the answer in terms of a natural logarithm and then round to three decimal places. $$y=2.5(0.7)^{x}$$

Explain how to solve an exponential equation when both sides cannot be written as a power of the same base. Use \(3^{x}=140\) in your explanation.

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