Pregunta
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
Solución de inteligencia artificial de Upstudy
Respuesta verificada por el tutor
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\( x = \frac{10}{9} \)
Solución
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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