Question

3^x=9x.find x

Answer 1

since 9=3^2, you have
3^3 = 3^2 * 3 = 9*3

Answer 2

Let say,3^x=m and x=cuberoot3. We get m=9cuberoot3,then take cube to both side; we get m^3=729m,divid both side by m; we get m^2=729.then,m=27 but 3^x=m and m=27; so,3^x=3^3. There4, x=3.