# Question #69c90

$\log \left(a + b\right) - \log \left(a\right)$
Use the logarithm rule $\log \left(\frac{a}{b}\right) = \log a - \log b$
Using this $\log$ rule, you are able to expand the compacted logarithm
$\log \left(\frac{a + b}{a}\right) = \log \left(a + b\right) - \log \left(a\right)$