The polynomial will be of integer coefficients always.
k will be given as square-root of some integer. 

Does that help? 



On Sunday, May 10, 2015 at 10:57:43 AM UTC-5, William wrote:
>
> On Sun, May 10, 2015 at 8:43 AM, Phoenix <[email protected] 
> <javascript:>> wrote: 
> > I have a polynomial which is of degree ~500 and a number $k$. 
> > I want to check two properties, 
>
> Your question is far too ambiguous.   You should make available an 
> explicit example of a polynomial and a k that are want to try to do 
> this with.    For example, this problem is completely different 
> depending o whether the coefficients of the polynomial are floating 
> point or say huge exact rational numbers, or maybe numbers in an 
> algebraic number field... 
>
> > 
> > - That all the roots of this polynomial are real 
> > 
> > - That the largest root is below $k$. 
> > 
> > What is the fastest way to check this? 
> > 
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>
>
> -- 
> William (http://wstein.org) 
>

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