Consider the function f(x)=4(x−3^2/3. For this function there are two important intervals: (−‡,A) and (A,‡) where A is a critical number.

Question

Consider the function f(x)=4(x−3^2/3. For this function there are two important intervals: (−‡,A)  and (A,‡)  where A  is a critical number. 
Find A

Consider the function f(x)=4(x−3^2/3. For this function there are two important intervals: (−�‡,A) and (A,�‡) where A is a critical number.