Solve each equation. Give solutions in exact form. ln 4x = 1.5

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Identify the given equation: $\ln 4x = 1.5$. This means the natural logarithm of \$4x$ equals $1.5$.

Recall that the natural logarithm function $\ln y$ is the inverse of the exponential function $e^y$. To solve for $x$, rewrite the equation in exponential form: $4x = e^{1.5}$.

Isolate $x$ by dividing both sides of the equation by 4: $x = \frac{e^{1.5}}{4}$.

Express the solution in exact form, which involves leaving the answer in terms of $e$ without approximating the value of $e^{1.5}$.

Check the solution by substituting $x$ back into the original equation to ensure the equality holds true.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Natural Logarithm (ln) Function

The natural logarithm, denoted as ln, is the inverse of the exponential function with base e. It answers the question: to what power must e be raised to get a given number? For example, ln(4x) = 1.5 means e raised to 1.5 equals 4x.

Solving Exponential and Logarithmic Equations

To solve equations involving logarithms, rewrite the equation in exponential form to isolate the variable. For ln(4x) = 1.5, rewrite as 4x = e^{1.5}, then solve for x by dividing both sides by 4.

Exact Form Solutions

An exact form solution expresses the answer without decimal approximations, often using constants like e or π. Here, the solution should be left as x = e^{1.5} / 4 rather than a decimal, preserving mathematical precision.

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