# Being brave 1

Algebra Level 5

$\large \displaystyle \sum^{2015}_{j=0} \sum^{2015 }_{i=1} x^{j}_{i}$

Consider a polynomial $$P(x)=\displaystyle \sum^{2016}_{n=1} n^2x^{2016-n}$$ and $$\{x_{i}\}_{i=1}^{2015}$$ are the roots of $$P(x)=0$$.

Find the value of the expression above.

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