Solve for 'W': Equation Rearranger Online Help

[kieyard]

Hi guys, Iv been stuck on this for well over an hour now, so I decided to use a equation rearranger online. However it gave me this, I just wanted to know what the value of 'W' is and how they got to that answer. Thanks in advance.

 

[mfb]

It is not a value, it is the Lambert W function. It is not a proper solution to the problem (there is no proper solution) - the function is defined to have the solution to a similar problem as its value, but there is no analytic way to evaluate it in general.

WolframAlpha should have included a link to the function definition.