Answer Happy

Find the intervals where the function is increasing and decreasing for the following function. f(x)=3x−x3 Select all the true statements below. f(x) is increasing on the interval (−∞,−1) f(x) is decreasing on the interval (−∞,−1) f(x) is increasing on the interval (−1,1) f(x) is decreasing on the interval (−1,1) f(x) is increasing on the interval (1,∞) f(x) is decreasing on the interval (1,∞)
Find the intervals where the function is concave upward and downward for the following function. f(x)=x3−3x2−9x Select all the true statements below. f(x) is concave upward on the interval (−∞,1) f(x) is concave downward on the interval (−∞,1) f(x) is concave upward on the interval (1,∞) f(x) is concave downward on the interval (1,∞)