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I tend to forget a lot of things, so I don't remember if this bug is already known and was reported and discussed here.
Anyway, Mathcads symbolics gives a wrong solution for a simple equation:
but if we use "fully", we get the correct solution, as any value from -1 down is a valid solution:
And also if we replace the square and square root by an absolute value, Mathcads answer is OK:
EDIT: Just noticed:
MuPad knows that
and so we get at least no wrong results if we simplify before we solve
Nevertheless, returning a numerical wrong result in the first place is an absolute no-go in my opinion.
Regards
Werner
Mathcad 11:
Fortunately not the 0 answer, but I'm not happy with the answer 'x'.
Possibly the Mathcad interface screws up the equation to, and/or the answer from the symbolic processor.
Luc
Thanks for the reply.
So Maple was at least not wrong - just not perfect 😉
> Possibly the Mathcad interface screws up the equation to, and/or the answer from the symbolic processor.
Interesting view and quite possible, I guess. We will never know for sure, though.