Question

0,8 (expoente : x) = (5/4)

Answer 1

$( \frac{8}{10} )^{x} = \frac{5}{4}$
$(\frac{10}{8})^{-x} = \frac{5}{4}$
-x = 1
x = -1

Answer 2

0,8^x=5/4
0,8^x=10/8
0,8^x=1/0,8
0,8^x=0,8^-1

x=-1