Solver error – Touch Fin RPN Review

Solve e^2x - 3e^x + 2 = 0 Input range of .1 to .8 gives the correct result same as a real 15C Input range of 0 to 1 and the real 15C says 0 which is a root. This app returns 1 which is incorrect. I now wonder what other bugs are in the solver.
Review by psb22 on Touch Fin RPN.