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For the function below, find (a) the critical numbers; (b) the open intervals where the function is increasing; and (c) the open intervals where it

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For the function below, find (a) the critical numbers; (b) the open intervals where the function is increasing; and (c) the open intervals where it is decreasing. f(x) = 8x3- 30x2- 144x +7 (a) Find the critical number(s). First, find f' (x). f' (x) =

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