Why is the negative root?

*To*: mathgroup at smc.vnet.net*Subject*: [mg69474] Why is the negative root?*From*: p-valko at tamu.edu*Date*: Wed, 13 Sep 2006 04:03:21 -0400 (EDT)

(Reduce[{z^3-z^2- b z-1==0, b>0, z>0}, z] //ToRadicals)/.b->3.//Chop gives a negativ z: z == - 0.414214 What am I doing wrong? Regards Peter

**Follow-Ups**:**Re: Why is the negative root?***From:*Andrzej Kozlowski <akoz@mimuw.edu.pl>