Solve each logarithmic equation in Exercises 49–92. Be sure to reject any value of x that is not in the domain of the original logarithmic expressions. Give the exact answer. Then, where necessary, use a calculator to obtain a decimal approximation, correct to two decimal places, for the solution. log₃x=4

검증된 단계별 안내

Identify the given logarithmic equation: $\log_{3} x = 4$.

Recall the definition of a logarithm: $\log_{a} b = c$ means $a^{c} = b$. Using this, rewrite the equation as $3^{4} = x$.

Calculate the value of \$3^{4}$ to find $x$. (You can leave it as an expression for the exact answer.)

Check the domain of the original logarithmic expression. Since $\log_{3} x$ is defined only for $x > 0$, ensure your solution satisfies this condition.

If needed, use a calculator to find the decimal approximation of $x$ to two decimal places.

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영상 길이:

주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Definition of Logarithms

A logarithm answers the question: to what exponent must the base be raised to produce a given number? For example, log₃(x) = 4 means 3 raised to the power 4 equals x. Understanding this definition allows you to rewrite logarithmic equations in exponential form to solve for the variable.

Domain of Logarithmic Functions

The domain of a logarithmic function log_b(x) includes only positive real numbers (x > 0) because logarithms of zero or negative numbers are undefined. When solving logarithmic equations, it is essential to check that solutions fall within this domain to ensure they are valid.

Exact and Approximate Solutions

Logarithmic equations often yield exact solutions expressed in exponential form. However, when a decimal approximation is required, a calculator can be used to find a numerical value, typically rounded to a specified number of decimal places, such as two decimals for clarity and precision.