How many critical points does the function below have on this specific interval?

How many critical points does the function f(:1:) = 63in2 (83:) have on the interval (0, 11') ? Provide the x-coordinate for each of the first 2 critical points below in increasing order. Note that the interval does not include 0 or 7?. Include a multiplication sign between terms (e.g. 3*x). Type Pi for 71'. Number of critical points: Number First critical point