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Re: NSolve unable to find all possible roots

  • To: mathgroup at smc.vnet.net
  • Subject: [mg115621] Re: NSolve unable to find all possible roots
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Sun, 16 Jan 2011 05:55:54 -0500 (EST)

There is only the root x = 0. 

Note that the argument of Sqrt[-13.319-x^2] is always negative so its value is always complex.


Bob Hanlon

---- Luiz Melo <luiz.melo at polymtl.ca> wrote: 

=============
Dear mathgroup,
The equation below has three possible roots, namely: 0., 1.99, -1.99.

eq = x*(Sqrt[-13.319 - x^2] + 2.41*Sqrt[1.004 - x^2])

If we try NSolve[eq == 0, x], we get {{kx-> 0.}} only.

How to instruct NSolve to search for the other two roots of the above equation?

Thank you
Luiz Melo



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