Let $ n>0$ be a natural number. Determine all the polynomials of degree $ 2n$ with real coefficients in the form 
$ P(X)\equal{}X^{2n}\plus{}(2n\minus{}10)X^{2n\minus{}1}\plus{}a_2X^{2n\minus{}2}\plus{}...\plus{}a_{2n\minus{}2}X^2\plus{}(2n\minus{}10)X\plus{}1$,
if it is known that all the roots of them are positive reals.

[i]Proposer[/i]: [b]Baltag Valeriu[/b]