Find the open interval(s) on which f(x) = -5x² + 50x+8 is increasing or decreasing. O increasing on (− ∞, 10); decreasing on (10, ∞) O increasing on (-∞, 16); decreasing on (16, ∞ ) O increasing on (-∞, 80); decreasing on (80, ∞) O increasing on (-∞, 40); decreasing on (40, ∞) O increasing on (-∞, 5); decreasing on (5, ∞)

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