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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