Consider the function f(x) = x 2 - (a) Find the domain of f. (Enter your answer using interval notation.) (b) Find the intervals on which f is increasing. (Enter your answer as a comma-separated list of intervals.) Find the intervals on which f is decreasing. (Enter your answer as a comma-separated list of intervals.) (c) Find the open intervals on which f is concave up. (Enter your answer as a comma-separated list of intervals.) Find the open intervals on which fis concave down. (Enter your answer as a comma-separated list of intervals. ) (d) Find the vertical asymptotes of f. smaller x-value X = larger x-value X : Find the left- and right-handed limits as we approach a vertical asymptote. As we approach the smaller x-value, the left-handed limit of f is ---Select---