Question
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Solve the following logarithmic equation. \( \begin{array}{l}\log _{10}(4 x)=2 \\ x=15 \\ x=30 \\ x=20 \\ x=25\end{array} \)

Ask by Marshall Vaughn. in the United States
Jan 26,2025

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Answer

\( x = 25 \)

Solution

To solve the logarithmic equation: \[ \log_{10}(4x) = 2 \] **Step 1: Convert the logarithmic equation to its exponential form.** Recall that \(\log_b(a) = c\) is equivalent to \(b^c = a\). Applying this to the given equation: \[ 10^2 = 4x \] **Step 2: Simplify the equation.** \[ 100 = 4x \] **Step 3: Solve for \(x\).** \[ x = \frac{100}{4} = 25 \] **Conclusion:** The correct value of \(x\) that satisfies the equation \(\log_{10}(4x) = 2\) is: \[ \boxed{25} \]

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Bonus Knowledge

To solve the logarithmic equation \( \log_{10}(4x) = 2 \), we can start by rewriting the equation in exponential form. This means \( 4x = 10^2 \). Since \( 10^2 = 100 \), we have: \[ 4x = 100 \] Now, dividing both sides by 4 gives: \[ x = \frac{100}{4} = 25 \] So, the solution to the equation is \( x = 25 \). The correct answer from the options provided is \( x = 25 \).

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