Re: [Phys-l] Alpha dawn

[Brian Whatcott <betwys1@sbcglobal.net>]

I earlier wrote:
> And now, the moment for which you have been waiting....
> Wolfram Alpha - a first look on  Ars Technica
> <http://arstechnica.com/web/news/2009/05/wolfram-alpha-set-for-launch-first-look-unveiled.ars>
> or in tiny form:
> http://preview.tinyurl.com/oyoz5w
>
> Brian W
>   

Here's my first test-drive of ...
<http://www.wolframalpha.com/>

solve -2exp(-1/t) = (0.2t -1)/(1-0.2t + 1)
t = 0.683751     ....and a second solution and a graph.
Fast!


(This was Bob Sciamanda's formulation and sample parameters
of the following note from Roberto.)

Hello:

I am dealing with a chemical temperature reaction calculus,  in certain note I have found  the asseveration that an equation of the following form have 3 solutions:



  A * e^(-r/t)
_________________        =         ( B * x - C)

 1 + A * e^(-r/t)


where ^ denotes exponentiation , and e is the Euler number 2.71......


I can´t found the deduction of it. I tried with Matlab symbolic algebra toolbox, but it stated 'Unable to find closed form solution.'  Do you know where can I find the solution ? Or do you know a software package capable of resolve it ?.

My best regards.
Roberto [Carabajal]

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BrianW