Answer
$ln(\frac{(x+9)^{8}}{x^{4}})$
Work Step by Step
According to the power rule of logarithms, we know that $log_{b}M^{p}=plog_{b}M$ (when $b$ and $M$ are positive real numbers, $b\ne1$, and $p$ is any real number).
Therefore, $8ln(x+9)-4ln(x)=ln(x+9)^{8}-ln(x^{4})$.
Based on the quotient rule of logarithms, we know that $log_{b}(\frac{M}{N})=log_{b}M-log_{b}N$ (where $b$, $M$, and $N$ are positive real numbers and $b\ne1$).
Therefore, $ ln(x+9)^{8}-ln(x^{4})=ln(\frac{(x+9)^{8}}{x^{4}})$.
In this case, the given logarithm is a natural logarithm with an understood base of $e$.