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Solve. See Example 4. $$ \log _{3} x=4 $$

Short Answer

Expert verified
The value of \( x \) is 81.

Step by step solution

01

Understand Logarithmic Form

The given equation is \( \log_{3} x = 4 \). This is a logarithmic equation where 3 is the base, x is the argument, and 4 is the exponent or result.
02

Rewrite in Exponential Form

To solve the logarithmic equation, we convert it to its exponential form. The equation \( \log_{3} x = 4 \) can be rewritten as \( 3^{4} = x \).
03

Calculate the Power

Now, calculate the value of \( 3^{4} \). This is \( 3 \times 3 \times 3 \times 3 \), which equals 81.
04

State the Solution

Since \( 3^{4} = 81 \), the solution to the equation \( \log_{3} x = 4 \) is \( x = 81 \).

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Key Concepts

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

Exponential Form
Understanding exponential form is crucial when dealing with logarithmic equations. Exponential form is a way to express repeated multiplication of a base number. For example, in the expression \(3^4\), 3 is the base, and 4 is the exponent. This means that 3 is multiplied by itself four times: \(3 \times 3 \times 3 \times 3\). It results in the number 81.

Exponential form is particularly useful when converting logarithmic equations into a more solvable format. By doing this, you can break down complex equations into more manageable calculations. This is because exponential representation directly connects the base with the other components, providing a clear path to solving many mathematical problems.
Logarithmic Form
Logarithmic form is another way to express relationships between numbers, especially those involving exponents. In the equation \(\log_{3} x = 4\), the number 3 is known as the base, x is the argument, and 4 is the exponent. Here, the equation says that 3 raised to the power of 4 will give you the argument, x.

Logarithmic form helps to find unknown exponents in equations. It's particularly useful in situations where the exponent is not immediately clear. For example, if you know the base and result but not the exponent, converting to logarithmic form allows you to easily solve for that unknown exponent.
  • Base: The number that gets multiplied (3 in our example).
  • Exponent/Result: The power to which the base is raised to produce the argument (4 here).
  • Argument: The outcome of the base raised to the exponent (x).
Solving Logarithms
Solving logarithms often involves converting them to exponential form, which simplifies the process. Taking the original equation \(\log_{3} x = 4\), you convert it to \(3^{4} = x\). This conversion makes it straightforward to solve for x, because you just calculate the power.

Here is how you solve it:
  • Convert the logarithmic equation to its exponential form.
  • Compute the value of the exponential expression.
  • Use simple arithmetic to solve for the unknown.
In our case, converting \(\log_{3} x = 4\) gives us \(3^{4} = x\). Calculating \(3^{4}\) involves multiplying 3 by itself four times, resulting in 81. Therefore, in this equation, x equals 81.

By understanding and applying these steps, solving logarithms becomes a more approachable task.

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Most popular questions from this chapter

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The formula \(y=y_{0} e^{k t}\) gives the population size \(y\) of a population that experiences an annual rate of population growth \(k\) (given as a decimal. In this formula, \(t\) is time in years and \(y_{0}\) is the initial population at time \(0 .\) Use this formula to solve Exercises 69 and 70. In 2010 , the population of Michigan was approximately \(9,939,000\) and decreasing according to the formula \(y=y_{0} e^{-0.003 t} .\) Assume that the population continues to decrease according to the given formula and predict how many years after which the population of Michigan will be \(9.500,000 .\) (Hint: Let \(y_{0}=9,939,000 ; y=9,500,000,\) and solve for \(t .\) (Source: U.S. Bureau of the Census)

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