Question: Question 1 Let f(x) = 5x4 - 8x3. (a) Use the definition of a derivative or the derivative rules to find f'(x) = 20x +

Question 1 Let f(x) = 5x4 - 8x3. (a) Use the definition of a derivative or the derivative rules to find f'(x) = 20x" + 3x- (b) Use the definition of a derivative or the derivative rules to find f" (x) = 20x" + 3x- (c) On what interval is f increasing? Increasing: (-0.15.0) U (0,00) (d) On what interval is f decreasing? Decreasing: (-00,-0.15) (e) On what interval is f concave downward? Concave Down: (f) On what interval is f concave upward? Concave Up

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