Groups > comp.soft-sys.math.maple > #328

Re: Solve Polynomial

From	Peter Pein <petsie@dordos.net>
Newsgroups	comp.soft-sys.math.maple
Subject	Re: Solve Polynomial
Date	2012-01-21 19:50 +0100
Organization	1&1 Internet AG
Message-ID	<jff1d3$qh4$1@online.de> (permalink)
References	<bYidnZptqfcV34fSnZ2dnUVZ_o2dnZ2d@megapath.net> <nZWdne_dyccLYIfSnZ2dnUVZ_rCdnZ2d@megapath.net>

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Am 21.01.2012 19:01, schrieb Thomas Dean:
> On 01/20/12 20:43, Thomas Dean wrote:
>> eq2 := op(1, deq) = op(2, deq);
>> solve(eq2,x,AllSolutions);
>
> eqn := (2*x^2-5*x+2)/(5*x^2-7*x-6);
> 2
> 2 x - 5 x + 2
> eqn := --------------
> 2
> 5 x - 7 x - 6
>
> deq:=diff(eqn,x);
> 2
> 4 x - 5 (2 x - 5 x + 2) (10 x - 7)
> deq := -------------- - ---------------------------
> 2 2 2
> 5 x - 7 x - 6 (5 x - 7 x - 6)
>
> solve(deq=0,x);
> eq2 := op(1, deq) = op(2, deq);
> 2
> 4 x - 5 (2 x - 5 x + 2) (10 x - 7)
> eq2 := -------------- = - ---------------------------
> 2 2 2
> 5 x - 7 x - 6 (5 x - 7 x - 6)
>
> solve(eq2,x,AllSolutions);
> 1/2 1/2
> 37 2649 37 2649
> -- - -------, -- + -------
> 80 80 80 80
>
> evalf(%);
> -0.1808554616, 1.105855462

If you want deq=0, you should look at
eq2 := op(1, deq) = -op(2, deq);
(please note the sign of op(2,deq);

Cheers,
Peter

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Solve Polynomial Thomas Dean <tomdean@speakeasy.net> - 2012-01-20 20:43 -0800
  Re: Solve Polynomial "Nasser M. Abbasi" <nma@12000.org> - 2012-01-20 23:52 -0600
    Re: Solve Polynomial "G. A. Edgar" <edgar@math.ohio-state.edu.invalid> - 2012-01-21 07:35 -0700
  Re: Solve Polynomial Thomas Dean <tomdean@speakeasy.net> - 2012-01-21 10:01 -0800
    Re: Solve Polynomial Thomas Dean <tomdean@speakeasy.net> - 2012-01-21 10:09 -0800
    Re: Solve Polynomial Peter Pein <petsie@dordos.net> - 2012-01-21 19:50 +0100
  Re: Solve Polynomial acer <maple@rogers.com> - 2012-01-21 10:04 -0800

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