Question

4.2(elevado a x)+2(elevado a x-1)=72
resolvam essa pra mim, pfv :3 coloquem o cálculo se der ^^

Answer 1

$4.2^{x} + 2^{x-1} =72$
$4.2^{x} + 2^{x}. 2^{-1} =72$
$4.2^{x} + 2^{x}. \frac{1}{2} =72$
$\frac{9. 2^{x} }{2} =72$
${9. 2^{x} } =72.2$
${9. 2^{x} } =144$
$2^{x} = \frac{144}{9}$
$2^{x} =16$
$2^{x} = 2^{4}$
$x=4$