Discussion
Logarithm of a product is the
Answer: D
\[ \log(ab) = \log a + \log b \]
The logarithm of a product is the sum of the logarithms. The companion rules are
\[ \log\left(\frac{a}{b}\right) = \log a - \log b, \qquad \log(a^{n}) = n\log a \]
Turning multiplication into addition is exactly what made logarithms a calculating tool.
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