Answer:
[tex]\ln (3x)^2=16\\\\\frac{\ln{(3x)^2}}{\ln e}=16\\\\\ln{(3x)^2}=16 \ln e\\\\\ln{(3x)^2}=\ln e^{16}\\\\(3x)^2=e^{16}\\\\ (3x)^2=[e^{8}]^2\\\\3x=\pm e^8\\\\x=\frac{\pm e^8}{3}[/tex]
