Answer
$\displaystyle \log_{b}\frac{36}{4}$ or $\log_{b}9$
Work Step by Step
$\log_{b}36-\log_{b}4=\qquad$ ... apply $\displaystyle \log_{a}\frac{M}{N}=\log_{a}M-\log_{a}N$
$=\displaystyle \log_{b}\frac{36}{4}\quad$ or $\quad\log_{b}9$
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