Find the critical numbers and the open intervals on which the function is increasing or decreasing. Use a graphing utility to verity your results. y = x³ - 27x + 7 Begin by finding the derivative of y. y' = STEP 1: STEP 2: STEP 3: Find the critical numbers. (Enter your answers as a comma-separated list. If an answer does not exist, enter DNE.) X = Test the intervals to determine the open intervals on which the function is increasing or decreasing. (Enter your answers using interval notation.) increasing decreasing

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