## Calculus 10th Edition

a) $-4$ b) $2$
$x^y = z \iff \log_{x}{z} = y$ a) $\log_3{\frac{1}{81}} = x \rightarrow 3^x = \frac{1}{81} \rightarrow x = -4$ b) $\log_6{36} = x \rightarrow 6^x = 36 \rightarrow x = 2$