I have an equation in which the variable I want to solve for is under a square root on both sides of the equation. The equation cannot be reduced or factored any further than it is. My HP 48GX has a root facility that makes short work of the problem, but I have not been able to figure out how to make Excel do it.

Someone mentioned to me that there might be a way to run an approximation routine through 'N' interations and come up something close, but I haven't figured out how to do that either.

Can anyone out there help??

Thanks in advance.