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MathGroup Archive 2008

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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



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