Find the local maximum and minimum values and saddle point(s) ofthe function. If you have three-dimensional graphing software,graph the function with a domain and viewpoint that reveal all theimportant aspects of the function. (Enter your answers as acomma-separated list. If an answer does not exist, enter DNE.)
f(x, y) =x3 + y3 −3x2 − 3y2− 9x
| local maximum value(s) | Â Â Â Â | | 5 Â Â |
| local minimum value(s) |     | | −31   |
| saddle point(s) | Â Â Â Â | (x, y, f)= |
