/*! 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 41 Solve for \(x\) algebraically. ... [FREE SOLUTION] | 91Ó°ÊÓ

91Ó°ÊÓ

Solve for \(x\) algebraically. $$\frac{10^{x}+10^{-x}}{10^{x}-10^{-x}}=5$$

Short Answer

Expert verified
After solving the given equation, we found that the solution for \(x\) is \(x = log_{10}(1) = 0\)

Step by step solution

01

Eliminate fractions

To simplify the task, the given equation needs to be free from fractions. To achieve this, multiply the entire equation by its denominator. \[10^{x}-10^{-x}\] This gives: \[10^{x}+10^{-x} = 5(10^{x}-10^{-x})\]
02

Simplify the equation

Next, simplify the equation by distributing the right side of the equation: \[10^{x}+10^{-x} = 5*10^{x} - 5*10^{-x}\] after distribution, we have: \[10^{x} + 10^{-x} = 5*10^{x} - 5*10^{-x}\] Then, subtract \(10^{x}\) and \(10^{-x}\) from both sides to put the equation in a more simplified form: \[10^{x} - 10^{x} + 10^{-x} - 10^{-x} = 5*10^{x} - 10^{x} - 5*10^{-x} + 10^{-x}\] This gives: \[0 = 4*10^{x} - 4*10^{-x}\]
03

Solve for x

Finally, solve for \(x\) in the simplified equation. Notice that the 4's can cancel out, leaving:\[0 = 10^{x} - 10^{-x}\]Setting \(10^{x} = y\), makes it easier to solve for \(x\):\[0 = y - 1/y\]Multiply through by \(y\):\[0 = y^2 - 1\]This is a difference of squares, so it can be factored as\[0 = (y-1)(y+1)\]Setting each factor to zero gives \(y = 1\) or \(y = -1\),But since \(10^{x}\) is always positive, the only valid solution is \(y = 1\), or \(10^{x} = 1\). To get \(x\), move to logarithm form:\[x = log_{10}(1)\]

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.

Algebraic Manipulation
Algebraic manipulation is a fundamental skill in mathematics that involves reshaping algebraic expressions into a form that is easier to understand or that lends itself to a particular method of solution. In the context of exponential equations, this process often includes techniques like distributing terms, combining like terms, and isolating the variable of interest.

For example, to simplify the given exercise where we have an exponential equation expressed in fractional form, the first step is to eliminate the fraction by multiplying through by the denominator. This is a direct application of algebraic manipulation. Then, we continue manipulating the equation by distributing and combining like terms. It's a bit like 'cleaning up' the equation to see what we're working with more clearly. This strategy is crucial for solving more complex equations efficiently.
Difference of Squares
The 'difference of squares' is a specific algebraic pattern that appears frequently in mathematics. It's the term used when an expression can be written in the form of \(a^2 - b^2\), which can be factored into \(a+b\) and \(a-b\). Recognizing this pattern is powerful because once an equation is in this form, it can be broken down into simpler parts.

In our exercise, after the algebraic manipulation steps have simplified the original equation, we arrive at \(y^2 - 1 = 0\), which is a difference of squares where \(a = y\) and \(b = 1\). Factoring the difference of squares simplifies the problem into solvable pieces, leading us to the value of \(y\) and, ultimately, the solution for \(x\). Understanding this concept helps in breaking down more complex equations that contain squares, making them much more manageable.
Logarithms
Logarithms are an essential concept in mathematics, particularly when dealing with exponential equations. A logarithm answers the question: 'To what power must a certain base be raised to obtain a certain number?' When dealing with base 10, the logarithm is denoted as \(\log_{10}\).

In the final steps of our problem, after determining that \(y = 1\), which comes from the difference of squares, we then revert back to the original substitution that set \(10^{x} = y\). To find the value of \(x\), we use a logarithm because we are looking for the exponent that makes 10 equal to 1. Hence \(x = \log_{10}(1)\). Logarithms transform the process of solving exponential equations into a more straightforward arithmetic problem, effectively 'unwrapping' the exponentiated form into a solvable equation for x.

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 velocity \(v\) of an object \(t\) seconds after it has been dropped from a height above the surface of the earth is given by the equation \(v=32 t\) feet per second, assuming no air resistance. If we assume that air resistance is proportional to the square of the velocity, then the velocity after \(t\) seconds is given by $$v=100\left(\frac{e^{0.64 t}-1}{e^{0.64 t}+1}\right)$$ a. In how many seconds will the velocity be 50 feet per second? b. Determine the horizontal asymptote for the graph of this function. c. Write a sentence that describes the meaning of the horizontal asymptote in the context of this problem.

The manager of a home improvement store finds that between 10 A.M. and 11 A.M., customers enter the store at the average rate of 45 customers per hour. The following function gives the probability that a customer will arrive within t minutes of 10 A.M. (Note: A probability of 0.6 means there is a \(60 \%\) chance that a customer will arrive during a given time period.) $$ P(t)=1-e^{-0.75 t} $$ a. Find the probability, to the nearest hundredth, that a customer will arrive within 1 minute of 10 A.M. b. Find the probability, to the nearest hundredth, that a customer will arrive within 3 minutes of 10 A.M. c. Use a graph of \(P(t)\) to determine how many minutes, to the nearest tenth of a minute, it takes for \(P(t)\) to equal \(98 \%\) d. Write a sentence that explains the meaning of the answer in part c.

Sketch the graph of each function. $$f(x)=4^{x}$$

Evaluate the exponential function for the given \(x\) -values. $$g(x)=10^{x} ; x=-2 \text { and } x=3$$

Involve the factorial function \(x !\), which is defined for whole numbers \(x\) as $$ x !=\left\\{\begin{array}{ll} 1, & \text { if } x=0 \\ x \cdot(x-1) \cdot(x-2) \cdot \cdots \cdot \cdot 3 \cdot 2 \cdot 1, & \text { if } x \geq 1 \end{array}\right. $$ For example, \(3 !=3 \cdot 2 \cdot 1=6\) and \(5 !=5 \cdot 4 \cdot 3 \cdot 2 \cdot 1=120\) During the period from 2: 00 P.M. to 3: 00 P.M., a bank finds that an average of seven people enter the bank every minute. The probability that \(x\) people will enter the bank during a particular minute is given by \(P(x)=\frac{7^{x} e^{-7}}{x !} .\) Find the probability, to the nearest \(0.1 \%,\) that a. only two people will enter the bank during a given minute. b. 11 people will enter the bank during a given minute.

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.