Question

4в степени x+1 + 4 в степени х = 320

Answer 1

$4^{x+1} +4^{x} =320$
$4^{x} (4+1) =320$
$4^{x}*5 =320$
$4^{x} =64$
$4^{x} =4^3$
$x=3$