How can I find the relative extrema and what is the value here?

Determine where the function is (a) increasing; (b) decreasing; and (c) determine where relative extrema occur. Do not sketch the graph. y=5x -x2+1 . . .. . (a) For which interval(s) is the function increasing? Select the correct choice below and, if necessary, fill in the answer box within your choice. The function is increasing on - 00 , NI (Type your answer in interval notation. Use a comma to separate answers as needed.) O B. The function is never increasing. (b) For which interval(s) is the function decreasing? Select the correct choice below and, if necessary, fill in the answer box within your choice. The function is decreasing on 2 (Type your answer in interval notation. Use a comma to separate answers as needed.) O B. The function is never decreasing. (c) What are the x-values of the relative extrema? Select the correct choice below and, if necessary, fill in the answer box within your choice. O A. x=] (Use a comma to separate answers as needed.) O B. There are no relative extrema