Maximum and Minimum Values of Functions

Find the relative extrema of the following functions by applying the first-derivative test and second derivative test. Determine the values of x at which the relative extrema occur as well as the intervals on which f is increasing and the intervals on which f is decreasing. Draw a sketch of the graph

9. = (x - 1)3 (x+2); 10. x)=3x -10x -12x3 +12x-7