QUESTION 8 (7 points) Let f(x)=2x³-3x²-12x-6 a. (3 pts) Find all points on the graph of f at which tangent line is horizontal. (Simplify your answer. Type an ordered pair. Use a comma to separate answers as needed.) b. (4 pts) Find all points on the graph of at which tangent line has slope 108 (Simplify your answer. Type an ordered pair. Use a comma to separate answers as needed.) For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac).

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