Problem Solver has with simple equation

[Nick1941]

One way around this problem is to define a function to perform the operation instead of using the Solver. For example, I created the function ElectronEnergy as -2.18E-18/n^2 with n as the input variable. Running ElectronEnergy(4) correctly and immediately produces the answer:
-1.3625E-19. Of course, to replace the Solver equation En = -2.18E-18/n^2, one would have to create two functions: one that computes En with n as the input (shown above) and the other that computes n with En as the input, such as a function called QuantumLevel as SQRT(-2.1E-18/En) with En as the input variable.