(1 point) Consider f(x) = x 3x 9x +4. Note: : Use round parentheses for your intervals (open interval notation). Separate multiple intervals with commas. For example, if the function is increasing between -2 and 0, and then again between 3 and infinity, you should write your answer as (-2,0),(3,infinity). The function is increasing in the region The function is decreasing in the region The Local Minimum for f(x) are (Note: List the coordinate points, with an x and y values. Separate multiple points with commas): The Local Maximum for f(x) are (Note: List the coordinate points, with an x and y values. Separate multiple points with commas):