Question

3 mũ 2x = 729

Answer 1

\(3^{2x}=\left(3^2\right)^x\)\(\Rightarrow9^x=729\)\(\Rightarrow x=3\)

Answer 2

\(3^{2x}\) = 729

<=>\(9^x\) = 729

<=>9 . 9 .9 = 729

<=>  \(9^3\) = 729

<=>   x        =3

Vay :x=3

Answer 3

3^2x = 729 

9^x=729

 Ta có : 9.9.9=729

=> x = 3