Question
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Find \( x \) in the following equation. \[ \log _{10}(x+5)-\log _{10}(x-5)=1 \] \( x=\square \) (Type a fraction or an integer. Simplify your answer.)

Ask by Hanson Warner. in the United States
Mar 11,2025

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Tutor-Verified Answer

Answer

\( x = \frac{55}{9} \)

Solution

We start with the equation: \[ \log_{10}(x+5) - \log_{10}(x-5) = 1 \] **Step 1.** Use the logarithm property: \[ \log a - \log b = \log\left(\frac{a}{b}\right) \] to combine the logarithms: \[ \log_{10}\left(\frac{x+5}{x-5}\right)= 1. \] **Step 2.** Rewrite the logarithmic equation in exponential form. Recall that if \(\log_{10}(y) = 1\), then: \[ y = 10^1 = 10. \] Thus: \[ \frac{x+5}{x-5} = 10. \] **Step 3.** Solve the equation: \[ x+5 = 10(x-5). \] Expand the right-hand side: \[ x + 5 = 10x - 50. \] **Step 4.** Collect like terms: \[ 5 + 50 = 10x - x, \] which simplifies to: \[ 55 = 9x. \] **Step 5.** Solve for \(x\): \[ x = \frac{55}{9}. \] Thus, the solution is: \[ x=\frac{55}{9}. \]

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To solve the equation \[ \log_{10}(x+5) - \log_{10}(x-5) = 1, \] we can use the properties of logarithms, specifically the quotient rule: \[ \log_{10}\left(\frac{x+5}{x-5}\right) = 1. \] Exponentiating both sides gives us: \[ \frac{x+5}{x-5} = 10. \] Next, we can solve for \( x \). Cross-multiplying gives: \[ x + 5 = 10(x - 5). \] Expanding the right side: \[ x + 5 = 10x - 50. \] Rearranging the equation: \[ 5 + 50 = 10x - x, \] which simplifies to \[ 55 = 9x. \] Dividing by 9 gives: \[ x = \frac{55}{9}. \] Therefore, the solution is \[ x = \frac{55}{9}. \]

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