Question

como faço a letra b??

Answer 1

$log { \frac{1}{4} } 2 \sqrt{2}=x$
$\frac{1}{4} ^{x} =2 \sqrt{2}$
$\frac{1}{4} ^{x} =8^{ \frac{1}{2} }$
$2^{-2x} =2^{ \frac{3}{2} }$
$4^{-x} =8^{ \frac{1}{2} }$
$-2x= \frac{3}{2}$
$x=-3$