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: <email@example.com>
- 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.) >