Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
2000
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*November
*December
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 2000

[Date Index] [Thread Index] [Author Index]

Search the Archive

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

  • To: mathgroup at smc.vnet.net
  • Subject: [mg23404] An example of a quadratic that version 2.2.2 can not solve but version 3 does...
  • From: zeno at magicnet.net
  • Date: Sat, 6 May 2000 19:14:13 -0400 (EDT)
  • Organization: Verio
  • Sender: owner-wri-mathgroup at wolfram.com

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.) 


  • Prev by Date: win 2000 and bracket-maching speed
  • Next by Date: Re: The most efficient Fibonacci algorithim?
  • Previous by thread: Re: win 2000 and bracket-maching speed
  • Next by thread: Re: An example of a quadratic that version 2.2.2 can not solve but version 3 does...