Find Where Increasing/Decreasing P(x)=-2x^3-14x^2+2x+83

$P (x) = - 2 x^{3} - 14 x^{2} + 2 x + 83$

Graph the polynomial in order to determine the intervals over which it is increasing or decreasing.

Increasing on: $(- \frac{7 + 2 \sqrt{13}}{3}, - \frac{7 - 2 \sqrt{13}}{3})$

Decreasing on: $(- \infty, - \frac{7 + 2 \sqrt{13}}{3}), (- \frac{7 - 2 \sqrt{13}}{3}, \infty)$

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