Problem 3. (1 point) Find the inflection points of f(x) = 6X4 + 34x3 18K2 + 9. (Give your answers as a comma separated list, e.g., 3,-2.) inflection points = Problem 4. (1 point) Referring to the graph above, which of the following statements is correct: 0 A. f\"(x) changes Sign from - to + Q B. f\"(x) changes sign from + to Q C. f\"(x) 0 for all x