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MathGroup Archive 2000

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Re: An example of a quadratic that version 2.2.2 can not solve but version 3 does...

  • To: mathgroup at smc.vnet.net
  • Subject: [mg23409] Re: An example of a quadratic that version 2.2.2 can not solve but version 3 does...
  • From: zeno at magicnet.net
  • Date: Sun, 7 May 2000 21:17:56 -0400 (EDT)
  • References: <8f28v1$s9@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Oops, sorry folks. I made a typo in the last number..I had the last number
end in a 8 instead of the 9. Mathematica 2.2 does get it right..looks like I
need an upgrade!

----------
In article <8f28v1$s9 at smc.vnet.net>, zeno at magicnet.net wrote:


> Take the equation..
>
> 4877361379*x^2-9754525226*x+4877163849=0
>
> This equation has 2 complex roots whose true values are..
>
> x=.999979750116+2.89954639913*10^-10 i
>
> x=.999979750116-2.89954639913*10^-10 i
>
> Does anyone have any insight on the improvements to the Solve command in
> Version 3 that causes it to get it correct where version 2.2.2 does not?
>
> Version 2.2.2 gives back 2 real incorrect reuslts for x. Version 3 gets it
> correct by returning the 2 complex correct results.
>
> (This quadratic equation example is from the Advanced Functions Handbook for
> the HP15C calculator. It is an example of a tough to solve quadratic.)
> 


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