Learning Task 4: Find the extrema of the following function on the given inter- val, if there are any, and determine the values of x at which the extrema occur. Do this in your notebook. 1. f(x) = 5x2-20x³ [0, 2] [1,4] 2. f(x) = x³-9x2 + 15x - 24 3. f(x) = 4x2 - 8x + 5 [-2, 21

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