I need help on this question

For the function f (x) =-3x' + 361 + 14, find all intervals where the function is increasing: f is increasing on (Give your answer as an interval or a list of intervals, e.g., (-infinity,8] or (1,5), (7,10) ) Similarly, find all intervals where the function is decreasing: f is decreasing on Give your answer as an interval or a list of intervals, e.g., (-infinity,8] or (1,5),(7,10) ) Finally, find all critical points in the graph of f(x) critical points: I (Enter your @-values as a comma-separated list, or none if there are no critical points.)