2. (20 points) For the function y = f(x) = " -3z'-45x-3 find the following without using any technology. Only the answers with complete justification will get credit in the parts a)-d). a) (4 points, justify your answer) intervals where the function increases and decreases b) (4 points, justify your answer) local maximum/ minimum c) (4 points, justify your answer) intervals where the function is concave up/down d) (4 points, justify your answer) inflection points (if they exist) e) (4 points, justify your answer) based on the previous steps, sketch a graph of this function