Re: Problem with Mathematica driving me nuts

*To*: mathgroup at smc.vnet.net*Subject*: [mg46837] Re: Problem with Mathematica driving me nuts*From*: lalu_bhatt at yahoo.com (Bhuvanesh)*Date*: Tue, 9 Mar 2004 19:57:52 -0500 (EST)*References*: <c2he1m$ahd$1@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

bpw67deletethis at hotmail.com (benwoodward.com) wrote: > FindRoot[x^2 == 4x - 4, {x, 1}] > > Out[4]= > {x -> 1.99902} > > In[15]:= > FindRoot[x^2 - 4*x + 4, {x, 3}] > > Out[15]= > {x -> 2.00098} > > When the root is clearly two. > Is Mathematica using Newton's Method like a Ti-92? > Even if so, why wont it give a more accurate answer? > I've tried N[%,30] but it doesn't do anything. > I'm new to Mathematica coming over from a Ti-92, so everything is > frustrating right now. > Thanks. If you give the above initial guesses to nSolve() (on a TI-68k calculator), you'll see that it returns 1.999999865 and 2.00000014254, respectively. Since you're using numerical root-finding methods, the answer will almost always be approximate. -- Bhuvanesh, Wolfram Research Disclaimer: Any opinions expressed herein are my own and not necessarily those of Wolfram Research.

**Follow-Ups**:**Re: Re: Problem with Mathematica driving me nuts***From:*tasande@MIT.EDU