For each function in Exercises, find (a) The critical numbers; (b) The open intervals where the function

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For each function in Exercises, find 

(a) The critical numbers;
(b) The open intervals where the function is increasing; and
(c) The open intervals where it is decreasing.

ƒ(x) = 4x3 - 9x2 - 30x + 6

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