points or rel

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    Critical Points/Rel. Extremes HELP

    Let f(x)=1/5x^5 + 3/2x^4 - 23x^3 + 23x^2 + 120x -56 Find : (a) the critical points of f (if any), (b) the open intervals on which the function is increasing or decreasing, and (c) the location of all relative extremes (if any). I'm kind of familiar with doing these but I have no idea on this...