Determine the open intervals on which the graph is concave upward or concave downward. g(x) = 9x2 − x3 Concave upward: (−∞, −3) (−∞, 3) (−3, ∞) (3, ∞) none of these Concave downward: (−∞, −3) (−∞, 3) (−3, ∞) (3, ∞) none of these
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Determine the open intervals on which the graph is concave upward or concave downward.