Find all critical numbers of the polynomial f(x) = 6x^3 - 54x^2 - 126x - 8 and then list them (separated by commas) in the box below. If there are no critical numbers, enter None.
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f'(x) = \frac{d}{dx}(6x^3 - 54x^2 - 126x - 8) Show more…
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