unwanted Complex result

*To*: mathgroup at smc.vnet.net*Subject*: [mg91589] unwanted Complex result*From*: John Rivers <first10 at btinternet.com>*Date*: Thu, 28 Aug 2008 03:18:38 -0400 (EDT)

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

**Follow-Ups**:**RE: unwanted Complex result***From:*"Jaccard Florian" <Florian.Jaccard@he-arc.ch>