17. Let f (x) = 16x 3 + x 3 . Where is f (x) increasing, decreasing, concave up, and concave down?

17. Let f (x) = 16x 3 + x 3 . Where is f (x) increasing, decreasing, concave up, and concave down? Find the local maximum points, local minimum points and the points of inflection of y = f (x) . Find the vertical and horizontal asymptotes of y = f (x) . GRAPH y = f (x) . 18. A farmer has 800 feet of fencing with which he plans to enclose a rectangular pen adjacent to a long existing wall. He will use the wall for one side of the pen and the available fencing for the remaining three sides. What is the maximum possible area that he can enclose in this way?