SubArea: Analyzing function behaviorLevel: BProject ID: 9000070302Source Problem: 9000070303Accepted: 1Clonable: 1Easy: 0Given function f(x)=x3+3x2+12x+4, find the intervals where f is a strictly concave down function.(−∞;−1)(−∞;0)(−∞;2)(−∞;4)
