/*! 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 103 In Exercises 101–104, write ea... [FREE SOLUTION] | 91Ó°ÊÓ

91Ó°ÊÓ

In Exercises 101–104, write each equation in its equivalent exponential form. Then solve for x. $$ \log _{4} x=-3 $$

Short Answer

Expert verified
The solution is \( x = \frac{1}{64} \)

Step by step solution

01

Convert logarithmic form to exponential form

The equation can be converted to exponential form using the formula \( \log_b{a} = n \) convert to base exponential form is \( b^n = a \). Substituting \( b = 4 \), \( a = x \), and \( n = -3 \), we get \( 4^{-3} = x \)
02

Evaluate the exponential expression

The expression \( 4^{-3} \) can be simplified to \( \frac{1}{4^3} \) or \( \frac{1}{64} \). This is because any number raised to a negative exponent is the reciprocal of the number raised to the positive exponent.
03

Solve for x

Equating the expression in exponential form to \( x \), implies \( x = \frac{1}{64} \)

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.

Converting Logarithms to Exponentials
Understanding the relationship between logarithms and exponentials is essential for solving equations that involve logarithms. When you encounter a logarithmic equation like \( \log_{b} a = n \), it’s often easier to address it by converting it to its equivalent exponential form, which is expressed as \( b^{n} = a \). This conversion is crucial because it transforms the problem into an exponential equation that is generally more straightforward to solve.

For example, if you have the logarithmic equation \( \log_{4} x = -3 \), apply this conversion to get the exponential form, which results in \( 4^{-3} = x \). This step takes you from a logarithmic expression to one involving an exponent, making it easier to evaluate and solve for the variable.
Solving for x in Exponential Equations
Once you've converted a logarithmic expression to an exponential equation, the next task is to isolate and solve for the variable, typically represented as 'x'. In exponential equations like \( a^{n} = x \), 'a' is the base, 'n' is the exponent, and you're trying to find the value of 'x' that makes the equation true.

To solve these equations, it's often helpful to rewrite the exponential expression in a way that is easier to calculate. Sometimes, this involves breaking down the base into simpler components or making the exponent positive if it's negative. After rewriting, you'll arrive at a result for 'x' that satisfies the original equation.
Negative Exponents
Negative exponents can seem intimidating at first, but they follow a simple rule that helps demystify them. An expression with a negative exponent, like \( a^{-n} \), means that you take the reciprocal of the base raised to the positive exponent.

Specifically, \( a^{-n} \) is equal to \( \frac{1}{a^{n}} \). This also implies that when you have an equation with a negative exponent, converting the negative exponent to a positive one will often make the equation simpler to understand and solve. For example, when you see \( 4^{-3} \), remember that it's equivalent to \( \frac{1}{4^{3}} \), which is easier to compute.
Exponential Expressions
An exponential expression is characterized by a base raised to a power, indicating how many times the base is multiplied by itself. The general form of an exponential expression is \( a^{n} \), where 'a' is the base, and 'n' is the exponent or power.

The properties of exponents play a pivotal role in simplifying and solving exponential expressions. When dealing with these expressions, such as \( 4^{-3} \) which simplifies to \( \frac{1}{4^{3}} \) or \( \frac{1}{64} \), remember that evaluating them correctly will lead you to the solution of 'x'. By mastering the rules that govern exponents, you can tackle a wide variety of problems involving exponential growth or decay, compound interest, and more mathematical applications.

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

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. $$ 3^{x}=2 x+3 $$

Solve the equation \(x^{3}-9 x^{2}+26 x-24=0\) given that 4 is a zero of \(f(x)=x^{3}-9 x^{2}+26 x-24\) Example \(6)\)

Explaining the Concepts You take up weightlifting and record the maximum number of pounds you can lift at the end of each week. You start off with rapid growth in terms of the weight you can lift from week to week, but then the growth begins to level off. Describe how to obtain a function that models the number of pounds you can lift at the end of each week. How can you use this function to predict what might happen if you continue the sport?

By 2019 , nearly \(\$$ I out of every \)\$ 5\( spent in the U.S. economy is projected to go for health care. The bar graph shows the percentage of the U.S. gross domestic product \)(G D P)\( going toward health care from 2007 through \)2014,\( with a projection for 2019 The data can be modeled by the function \)f(x)=1.2 \ln x+15.7\( where \)f(x)\( is the percentage of the U.S. gross domestic product going toward health care \)x\( years after \)2006 .\( Use this information to solve. a. Use the function to determine the percentage of the U.S. gross domestic product that went toward health care in \)2008 .\( Round to the nearest tenth of a percent. Does this underestimate or overestimate the percent displayed by the graph? By how much? b. According to the model, when will \)18.6 \%$ of the U.S. gross domestic product go toward health care? Round to the nearest year.

In Example I on page \(520,\) we used two data points and an exponential function to model the population of the United States from 1970 through 2010 . The data are shown again in the table. Use all five data points to solve Exercises \(66-70\). $$ \begin{array}{cc} {x, \text { Number of Years }} & {y, \text { U.S. Population }} \\ {\text { after } 1969} & {\text { (millions) }} \\ {1(1970)} & {203.3} \\ {11(1980)} & {226.5} \\ {21(1990)} & {248.7} \\ {31(2000)} & {281.4} \\ {41(2010)} & {308.7} \end{array} $$ Use the values of \(r\) in Exercises \(66-69\) to select the two model= of best fit. Use each of these models to predict by which yeathe U.S. population will reach 335 million. How do these answers compare to the year we found in Example \(1,\) namel \(=\) \(2020 ?\) If you obtained different years, how do you account fo this difference?

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.