Find the open interval(s) on which f(x) = -2x² + 12x+8 is

Last updated: 8/4/2022

Find the open interval(s) on which f(x) = -2x² + 12x+8 is increasing or decreasing. increasing on (→∞,6); decreasing on (6,∞) increasing on (-∞,16); decreasing on (16,∞) increasing on (-∞, 32); decreasing on (32,∞) increasing on (-∞, 24); decreasing on (24,∞) increasing on (-∞,3); decreasing on (3,∞)