Question

5 x 3 la puterea x - 2x3 la puterea x =81

Answer 1

5 x$3^{x}$ - 2x$3^{x}$=9²
$3^{x}$ x(5-2)=(3²)²
$3^{x}$ x3=3⁴
$3^{x+1}$=3⁴
x+1=4
x=4-1
x=3