Question 461053
Some calculators do not have the ln function, in which you can input it as the log base e (this is rare though, most calculators that allow log of any base will automatically have an ln button). Be careful that if you input e, it must be the constant e, not the variable e.


However you do not need a calculator to solve it. Follow the other tutor's solution, using the properties of logarithms, and it becomes a simple quadratic equation.