Find the critical points c for the function f and apply the Second Derivative Test (if possible) to determine whether each of these points corresponds to a local maximum (cmax) or minimum (cmin ). 3 f(x) = – x2 – 21x + 9 (Use symbolic notation and fractions where needed. Give your answer in the form of a comma separated list, if necessary. Enter DNE if there are no critical points.) Cmax = Cmin II

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