Re: Mathematica simplification of (1+x)/x

In article <eFGme.3251$dN6.1032@xxxxxxxx>,
"Dave Snead" <dsnead6@xxxxxxxxxxx> wrote:

> In Mathematica 5.1, I tried simplifying
> (1+x)/x
> with the side condition
> 1+x+x^2==0
>
> using
> FullSimplify[(1+x)/x, 1+x+x^2==0]
>
> It should come out
> -x
>
> but Mathematica shows
> 1 + 1/x
>
> Is Mathematica not able to handle this easy simplification,
> or am I not using the FullSimplify command correctly?

You need to use Reduce:

Reduce[{(1+x)/x == y, 1+x+x^2==0}, y]

Cheers,
Paul

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