Re: unwanted Complex result
- To: mathgroup at smc.vnet.net
- Subject: [mg91605] Re: unwanted Complex result
- From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
- Date: Thu, 28 Aug 2008 07:41:05 -0400 (EDT)
- References: <g95k8a$543$1@smc.vnet.net>
Hi, for a polynomial of 4. order there must not exist a real zero and you have to modify the parameters in polynomial to get real solutions. Regards Jens John Rivers wrote: > 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 > >