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For what value of \( x \) is the following true? \[ \log (x+10)=\log x+\log 10 \] Your answer is: \[ x=\square \] You may enter the exact value or round to 4 decimal places. Next Question

Ask by Rogers Watson. in the United States
Mar 15,2025

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Answer

\( x = \frac{10}{9} \)

Solution

1. Start with the given equation: \[ \log (x+10)=\log x+\log 10 \] 2. Use the logarithm property \(\log a + \log b = \log (ab)\) to combine the right-hand side: \[ \logx + \log 10 = \log(10x) \] Thus, the equation becomes: \[ \log (x+10) = \log (10x) \] 3. Since logarithm functions are one-to-one (assuming \(x>0\) and \(x+10>0\)), the arguments must be equal: \[ x + 10 = 10x \] 4. Solve for \(x\): \[ 10 = 10x - x = 9x \] \[ x = \frac{10}{9} \] 5. The solution is: \[ x=\frac{10}{9} \]

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Beyond the Answer

To solve the equation \( \log (x+10) = \log x + \log 10 \), we can use the property of logarithms that states \( \log a + \log b = \log (a \cdot b) \). This gives us: \[ \log (x+10) = \log (10x) \] By the property of logarithms, if the logs are equal, then their arguments must also be equal: \[ x + 10 = 10x \] Now, we can rearrange the equation: \[ 10 = 10x - x \] This simplifies to: \[ 10 = 9x \] Thus, we divide both sides by 9: \[ x = \frac{10}{9} \] So, your answer is: \[ x=\frac{10}{9} \]

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