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. >