Hi all! I have a problem when I use SOLVE with some equations that have two roots.

For example, consider the equation X^2 = 1. As you know, it has two solutions (x1 = 1, x2 = -1). HP 35s always shows me 1. Even when I choose the initial guesses for the negative root as described in the manual (section 7-8).

The same problem with the equation 0.5 = (1 + (%pi / LN(X))^2)^-0.5. It has two solutions (x1 = 0.16303353482158, x2 = 6.133707406236229) and I always get x2.

On the contrary, there are other equations that work well. For example: X^2+X-6=0. With that one, I can get the two solutions (x1 = 2, x2 = -3).

I do not know if I am doing something bad. Any idea?

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Notes:

%pi = Number PI

*Edited: 24 Sept 2010, 7:22 p.m. *