Question

log a 4= -2, qual valor de ''a''

Answer 1

$log_{a} 4$ = -2

$a^{-2}$ = 4
$( \frac{1}{a}) ^{2}$ = 4
$\frac{1}{ a^{2} }$ = 4
4a² = 1
a² = 1/4
a = √1/√4
a = 1/2