MathGroup Archive 2006

[Date Index] [Thread Index] [Author Index]

Search the Archive

Simplifying the root of a quadratic

  • To: mathgroup at smc.vnet.net
  • Subject: [mg63906] Simplifying the root of a quadratic
  • From: carlos at colorado.edu
  • Date: Sat, 21 Jan 2006 01:50:59 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

Consider

etaC=(-48*A0^2-4*A1^2+4*A2^2+
   Sqrt[768*A0^2*A2^2+(48*A0^2+4*A1^2-4*A2^2)^2])/(96*A0*A2);

Neither Simplify nor FullSimplify (with or without assumptions
on the A's) were able to produce the simpler form

etaC=(-12*A0^2-A1^2+A2^2+
   Sqrt[48*A0^2*A2^2+(12*A0^2+A1^2-A2^2)^2])/(24*A0*A2);

which I had to do finally by hand.

Why?


  • Prev by Date: correlated random vector
  • Next by Date: Question about Reduce
  • Previous by thread: Re: correlated random vector
  • Next by thread: Re: Simplifying the root of a quadratic