Question

400x= frac{1}{20} [/tex]
$2* 4^{x} =128$
$64^{2x} = frac{1}{4}$
$6x=-1$
$x=- frac{1}{6}$

Answer 1

$400x= frac{1}{20} , x= frac{1}{20*400}= frac{1}{8000}$$4^x=128:2, 4^x=64, 4^x=4^3, x=3$$4^{6x}= frac{1}{4}, 4^{6x}=4^{-1}, 6x=-1, x=- frac{1}{6}$