RE: unwanted Complex result

*To*: mathgroup at smc.vnet.net*Subject*: [mg91594] RE: [mg91589] unwanted Complex result*From*: "Jaccard Florian" <Florian.Jaccard at he-arc.ch>*Date*: Thu, 28 Aug 2008 07:39:05 -0400 (EDT)*References*: <200808280718.DAA04808@smc.vnet.net>

Hello, I use : Reduce[equations,vars,Reals] I think, it's the best way... And if you want rules, write : ToRules[Reduce[equations,vars,Reals]] You could also select your real solutions using "Cases", but it's more = complicated. Regards F.Jaccard -----Message d'origine----- De : John Rivers [mailto:first10 at btinternet.com] Envoy=E9 : jeudi, 28. ao=FBt 2008 09:19 =C0 : mathgroup at smc.vnet.net Objet : [mg91589] unwanted Complex result Solve[ (Sqrt[speed ^ 2 - windx ^ 2] + windy) / a speed ^ 2 + b speed + c == distance / height , speed] this works but returns 4 solutions that all return complex numbers I need a real number how do I: - convert a complex result into real number or - solve the equation to give only real numbers

**References**:**unwanted Complex result***From:*John Rivers <first10@btinternet.com>