opgave b

${}^g\log (a) = b \Leftrightarrow g^b = a$


uitwerking
$\eqalign{& {}^{\frac{1}{2}}\log \left( {\frac{1}{{4x}}} \right) = 4 \cr & \frac{1}{{4x}} = \left( {\frac{1}{2}} \right)^4 \cr & \frac{1}{{4x}} = \frac{1}{{16}} \cr & 4x = 16 \cr & x = 4 \cr} $

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