giai giup em cau 2 luy thua x +2luy thua x+3 =144 Question giai giup em cau 2 luy thua x +2luy thua x+3 =144 in progress 0 Môn Toán Nick 4 years 2020-11-13T08:47:11+00:00 2020-11-13T08:47:11+00:00 1 Answers 47 views 0
Answers ( )
$2^x+2^{x+3}=144$
$\Leftrightarrow 2^x+2^x.2^3=144$
$\Leftrightarrow 2^x(1+2^3)=144$
$\Leftrightarrow 9.2^x=144$
$\Leftrightarrow 2^x=16$
$\Leftrightarrow 2^x=2^4$
$\Leftrightarrow x=4$