How can I solve $$ax^x+bx+c=0$$ or $$ax^{x^x}+bx^x+cx+d=0$$ where $x^x$ and $x^{x^x}$ - tetration? Is there analogue of discriminant for it?

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    I'd be absolutely flabbergasted if normal polynomial methods applied here. (And not to be discouraging, but this equation looks pretty nasty in general.) – Chris Jan 16 at 5:18
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    Only numerical methods will do the job. – Claude Leibovici Jan 16 at 7:56

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