Question

How do you solve `ln x + ln 3x = 12`?

Answer 1

`x = + sqrt(3)/3 e^6`

Explanation:

`ln (x * 3x) = 12`

`x * 3x = e^12`

`x^2 = 1/3 e^12`

`x = ± sqrt(3)/3 e^6`

But x > 0.