Answer
$= \frac{1}{2}\log_4 x - 3$
Work Step by Step
$= \log_4 (\frac{\sqrt x}{64})$
$= \log_4 \sqrt x - \log_4 64$
$= \log_4 x^{\frac{1}{2}} - \log_4 (4)^{3}$
$= \frac{1}{2}\log_4 x - 3$
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