Assignment4: Problem 7 (1 point) Consider the function f(x) = 12 + 30x4-300x +2. f(x) has inflection points at (reading from left to right) = D, E, and F where D is and E is and Fis For each of the following intervals, tell whether f(x) is concave up (type in CU) or concave down (type in CD). (-, D]: [D, E): [E, F): [F,00): Note: You can earn partial credit on this problem. Preview My Answers Submit Answers You have attempted this problem 0 times. You have unlimited attempts remaining.