Question

Cum se rezolvă detaliat asta ?
$2^{x-1}+ 2^x=12$

Answer 1

$2^{x-1} +2^x=12$

$2^{x}:2 +2^x=12$

$2^{x}*(1/2+1)=12$

$2^{x}*3/2=12$

$2^{x}=12*2:3=8$

$2^{x}= 2^{3}$

$\boxed {x=3}$