Solve each equation. In Exercises 11–34, give irrational solutions as decimals correct to the nearest thousandth. In Exercises 35-40, give solutions in exact form. 3^x = 7

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Identify the equation to solve: \(3^x = 7\).

Since the variable \(x\) is in the exponent, apply the logarithm to both sides to bring the exponent down. You can use the natural logarithm (ln) or common logarithm (log). For example, take the natural logarithm: \(\ln(3^x) = \ln(7)\).

Use the logarithmic property that allows you to move the exponent in front: \(x \cdot \ln(3) = \ln(7)\).

Isolate \(x\) by dividing both sides of the equation by \(\ln(3)\): \(x = \frac{\ln(7)}{\ln(3)}\).

To find the decimal approximation, use a calculator to evaluate \(\ln(7)\) and \(\ln(3)\), then divide and round the result to the nearest thousandth.

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주요 개념

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Exponential Equations

An exponential equation is one in which the variable appears in the exponent, such as 3^x = 7. Solving these requires methods that can handle variables in exponents, often involving logarithms to isolate the variable.

Logarithms and Their Properties

Logarithms are the inverse operations of exponentials and are used to solve equations where the variable is an exponent. Applying the logarithm to both sides of an equation like 3^x = 7 allows you to rewrite it as x = log base 3 of 7, facilitating the solution.

Decimal Approximation of Irrational Numbers

When solutions involve irrational numbers, such as logarithms that do not simplify to rational numbers, it is common to approximate them as decimals. Rounding to the nearest thousandth means expressing the solution with three digits after the decimal point for practical use.

Solve each equation. In Exercises 11–34, give irrational solutions as decimals correct to the nearest thousandth. In Exercises 35-40, give solutions in exact form. 3x = 7