Question: P4. Let f(x) = 5x3 + 2x2 - 3x. (i) Find the local maximum and local minimum. (ii) Sketch its graph by using the critical

P4. Let f(x) = 5x3 + 2x2 - 3x. (i) Find the local maximum and local minimum. (ii) Sketch its graph by using the critical numbers, inflection number, f'(x) and f"(x) of the function

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