Solve example on various calculators

[lrdheat]

(X+1)*sqrt(X^2 -2*X -1) =0 on HP 35S, the roots at -1, ~-.41 are found. The root at ~2.41 produces a negative square root error. A similar experience on the TI-30X Pro…the ~2.41 root produces a no sign change error. The CASIO 991CW finds the ~2.41 root with ease, but the guess for the root at ~-.41 has to be correct to about 6 significant digits to find the root. The CASIO 9750giii has the same problem in the equation app, but finds the -1 and ~-.41 roots in calculate mode using SolveN and the Solve for a range of 2 to 3 finds the ~2.41 root ( a range encompassing the full range of roots only finds the ~2.41 root). Wonder how the methodologies differ amongst the calculators.