Re: Possible bug concerning a limit computation
- To: mathgroup at smc.vnet.net
- Subject: [mg71122] Re: Possible bug concerning a limit computation
- From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
- Date: Thu, 9 Nov 2006 03:37:20 -0500 (EST)
- Organization: The Open University, Milton Keynes, UK
- References: <eish78$nrd$1@smc.vnet.net>
geo_topos wrote:
> Hello everyone,
> I don't know if this is the right place to post this, but here it goes.
> I am a high-school math teacher from greece. I was working with my
> students on the limit:
>
> Limit[ (Sqrt[7x^4+6x+5] - Sqrt[7x^4+3x+3]) * Sqrt[63x^2-5x+20, x->
> Infinity]
>
> The result we got for that is 9/2. Mathematica 4.0 will produce the
> opposite result: -9/2.
Mathematica 5.2 agrees with the positive result
In[1]:=
Limit[(Sqrt[7*x^4 + 6*x + 5] - Sqrt[7*x^4 + 3*x + 3])*
Sqrt[63*x^2 - 5*x + 20], x -> Infinity]
Out[1]=
9
-
2
In[2]:=
$Version
Out[2]=
5.2 for Microsoft Windows (June 20, 2005)
Regards,
Jean-Marc