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Complex numbers in Mathematica

• To: mathgroup at smc.vnet.net
• Subject: [mg61647] Complex numbers in Mathematica
• From: per at RQNNE.invalid (Per Rønne)
• Date: Mon, 24 Oct 2005 21:07:04 -0400 (EDT)
• Reply-to: spam at RQNNE.dk (Per Rønne)
• Sender: owner-wri-mathgroup at wolfram.com

If I write:

In[8]=Factor[(5 - 3I) + (-4 + I)x + (1 - I)x^2]

I get
Nonreal::"warning": "Nonreal number encountered."
Out[8]= Nonreal

The same with Sqrt[-1].

Why doesn't it show the complex numbers? According to the books it
should - is it a matter of preferences set?

I'm using Mathematica Teacher's Edition 1.1 on MacOS X.
-- 
Per Erik Rønne

• Follow-Ups:
  • Re: Complex numbers in Mathematica
    • From: Murray Eisenberg <murray@math.umass.edu>
  • Re: Complex numbers in Mathematica
    • From: "Carl K. Woll" <carlw@wolfram.com>