[racket] Rusty Math

The number would have to be complex, but sure you can do that:

> (forn 0+10i)
#t

Robby

On Sun, Dec 26, 2010 at 6:04 AM, Sayth Renshaw <flebber.crue at gmail.com> wrote:
> I was doing an exmple and thinking about my expected retrun value to kow if
> my function worked.
>
> However I don't think any value could test true therefore my function would
> always be false. I do need to double check though as my math is rusty. But
> you cannot square a number and have it retun negative can you?
>
> This is my working.
>
> ;;; equation : number --> boolean
> ;;; to determine whether n is true for the equation (2 - n(squared) = 102)
> (define (forn x)
>   (= (- 2 (* x x) ) 102))
>
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