Question

3^х+2-3^х=216
решить уравнение) 

Answer 1

$3^{x+2} - 3^x =216$
$3^x*3^2- 3^x =216$
$9*3^x- 3^x =216$
$8*3^x =216$
$3^x =27$
x = 3

Answer 2

$3^{x+2}-3^{x}=216\\3^{x}cdot 3^2-3^{x}=216\\3^{x}(9-1)=216\\3^{x}=27,; ; ; 27=3^3\\x=3$