Find the critical numbers of the function. f(x) = x5 - 5x4 Step 1 To find the critical numbers of f, you must find all x-values for which f '(x) = 0 0 or f '(x) does not exist. does not exist. Step 2 Begin by differentiating the given function with respect to x and factor completely. f "(x) = 5x x3 - 5x(

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