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Find the critical numbers of $f$ . (Separate multiple answers by commas. Enter NONE if there are no values.)

Determine the intervals on which $f$ is increasing and decreasing. interval

$f$ is increasing on:

$f$ is decreasing on:

Use the First Derivative Test to determine whether each critical point is a relative maximum, minimum, or neither. (Separate multiple values by commas. Enter NONE if there are no values.)

Relative maxima occur at $x =$

Relative minima occur at $x =$