Question: Using a graphing calculator, estimate the interval on which the function is increasing or decreasing and any relative maxima or minima. (a) f(x) = x4

Using a graphing calculator, estimate the interval on which the function is increasing or decreasing and any relative maxima or minima.
(a) f(x) = x4 + 4x3 - 36x2 - 160x + 400
(b) f(x) = 3.22x5 - 5.208x3 - 11

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