Answer the following questions for the function )=x3x2−1 defined on the interval [−16,20]. a.) enter the x-coordinates of the vertical asymptotes of ) as a comma-separated list. that is, if there is just one value, give it; if there are more than one, enter them separated commas; and if there are none, enter none . b.) ) is concave up on the region . note: give your answer in interval notation. c.) enter the x-coordinates of the inflection point(s) for this function as a comma-separated list.