Find Where Increasing/Decreasing f(x)=3x^2+6x-72

$f (x) = 3 x^{2} + 6 x - 72$

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

Increasing on: $(- 1, \infty)$

Decreasing on: $(- \infty, - 1)$

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