Comment #13 on issue 1868 by smi...@gmail.com: solve(floating point, x) stopped working
http://code.google.com/p/sympy/issues/detail?id=1868
Mateusz, can you confirm that a general solution for a QUARTIC equation is not possible? So if a solution is requested and there are symbolic coefficients and it can't be factored then there is no point in returning a QUARTIC solution which (I believe) will not apply in all cases. So the quartic pre-processor would have to affirm that the signs of what needs to be known are known; and if not that then it would have to be factorable; and if not then then (at best) a Piecewise solution could be returned with the conditions being the constraints on the symbols that would apply to different cases.
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