For what value of \( x \) is the following true? \( \log (x+8)=\log x+\log 8 \). Your answer is \( x=\square \)
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To solve the equation \( \log (x+8) = \log x + \log 8 \), we can use the properties of logarithms. The right-hand side can be rewritten using the product property of logarithms: \[ \log (x+8) = \log (8x) \] Since the logarithmic function is one-to-one, we can set the arguments equal to each other: \[ x + 8 = 8x \] Now, rearranging the equation: \[ 8 = 8x - x \] \[ 8 = 7x \] Dividing both sides by 7 gives: \[ x = \frac{8}{7} \] Thus, the value of \( x \) is \( \frac{8}{7} \).