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MathGroup Archive 2006

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Why is the negative root?

  • To: mathgroup at
  • Subject: [mg69474] Why is the negative root?
  • From: p-valko at
  • 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?

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