I was doing homework problems and kept on getting this wrong

1. Determine where the function is increasing/decreasing and determine where the relative extrema occur. (4 marks) a. y = 3x3 - 16x - 1 2. Find the absolute extrema of the given function on the given interval (3 marks). a. f(x) = =x3 - 2x2 + 3x - 1 on the interval [0,5]