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MathGroup Archive 2000

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Re: [Q] Solve?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg23411] Re: [Q] Solve?
  • From: Alan <alana at mac.com>
  • Date: Sun, 7 May 2000 21:17:57 -0400 (EDT)
  • References: <8f29a1$uf@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

The answer is
{{z -> -2.32406},{z -> 0.0222558-1.39113 I},{z->0.0222558+1.39113 I}}

Just try reformatting it so that there is no line breaks or returns
after each line that is supposed to be multiplied.

James wrote:

> Hi!
>
> I come across a problem that I don't understand.
> I generate systems of equations
> and try to solve them using mathematica.
> For example,
>
> ---------------------------------------------------------------
> In[1]= Solve[((4/2)*( 1.50*z+ 2.00)+(4-4/2)*
>                      Sqrt[( 1.50*z+ 0.00)^2+ 4.00]) +
>                 ((4/2)*( 1.50*z+ 2.00)+(4-4/2)*
>                      Sqrt[( 1.50*z+ 0.00)^2+ 4.00])- 8.10*z==0, z]
>
> Out[1]= {}
> ---------------------------------------------------------------
>
> But mathematica can't solve it, simply returing empty.
> This equation can be solved, though, as you see.
> I restarted mathematica to run again, but it doesn't help.
>
> The weird thing is some equations are solved, like the below.
> ---------------------------------------------------------------
> In[2]= Solve[((4/2)*( 1.50*z+ 2.00)+(2-4/2)*
>                      Sqrt[( 1.50*z+ 0.00)^2+ 4.00]) +
>                 ((4/2)*( 1.50*z+ 2.00)+(3-4/2)*
>                      Sqrt[( 1.50*z+ 0.00)^2+ 4.00])- 8.10*z==0, z]
>
> Out[2]= {{z->13.4976}}
> ---------------------------------------------------------------
>
> What's wrong with it and how can I solve it?
> I need to use mathematica, because the number of the systems
> of equations are large.
> (Please disregard any redundunt terms in the equations..
> they are generated by a program.)
> With that, when does mathematica return '{}' as an answer?
> Thank you.
>
> --- James, newbie in mathematica.
>


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