Question

se 5^3x-6=8 então 5^-x = ?

Answer 1

$( {5}^{ - x}) = x$
$( {x \times 5}^{ - x}) = (5 \times x)$
$( {5x}^{ - x} ) = (5x)$
$- x = 1 \: \: \: \times ( - 1)$
$x = - 1$