Mathematica 9 is now available
Services & Resources / Wolfram Forums / MathGroup Archive
-----

MathGroup Archive 2012

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

Search the Archive

"Solve" on polynomial equality results in expressions containing "Root"

  • To: mathgroup at smc.vnet.net
  • Subject: [mg128518] "Solve" on polynomial equality results in expressions containing "Root"
  • From: coder0xff at gmail.com
  • Date: Fri, 26 Oct 2012 23:48:31 -0400 (EDT)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com
  • Delivered-to: l-mathgroup@wolfram.com
  • Delivered-to: mathgroup-newout@smc.vnet.net
  • Delivered-to: mathgroup-newsend@smc.vnet.net

If I do Solve[y==3x^2-2x^3,x] I get expressions containing imaginary parts. If I set the domain to the Reals (Solve[y==3x^2-2x^3,x,Reals]) then I got stuff like Root[y - 3 #1^2 + 2 #1^3 &, 2]. I know there's a solution using only reals (since the range and domain are both real, and complex math is performed as operations on reals after all) How can I get it to give me the actual solution using only reals?



  • Prev by Date: Re: CDF Security
  • Next by Date: Re: Trying to use Mathematica as "word processor" for my math homework
  • Previous by thread: Re: Second derivatives
  • Next by thread: Re: "Solve" on polynomial equality results in expressions