Consider the following curve. f ( x ) = X - 6 x 2 Determine the domain of the curve. (Enter your answer using interval notation.) (-00,0), (0,00)Find the interval(s) on which fis concave down. (Enter your answer using interval notation.) (-00,0), (0,18) Find the local minimum and maximum values of f. (Enter your answers as comma-separated lists. If an answer does not exist, enter DNE.) local minimum values DNE local maximum values 12 X