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(i) Let f(x) = (x -2)(x + 4). Find critical numbers of f. Then determine if the critical number is a local minimum, local maximum,

(i) Let f(x) = (x -2)(x + 4). Find critical numbers of f. Then determine if the critical number is a local minimum, local maximum, or neither. (ii) Then determine intervals on which f is increasing and intervals on which it is decreasing

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