"Paul Fuller" <pgf### [at] optusnetcomau> wrote in message
news:486f6167$1@news.povray.org...
> Orchid XP v8 wrote:

> > For example, (A*B)^2 - 4*(A+B) = (A-B)^2. Obvious once you know, but
> > DAMN... I've have never thought of it!

> Well that is true for some values of A an B - But probably not as many
> as you think.
>
> Whereas (A+B)^2 - 4*(A+B) = (A-B)^2 is true a few more cases.

Still, not true for as many cases as

(A+B)^2 - 4*A*B = (A-B)^2

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