21. Determine all critical points for the following function. f(x) x-256x EX What is the derivative of f(x)x2-256Vx? f(x) Find the critical points, if any, of f on the domain. Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. The critical point(s) occur(s) at x = (Use a comma to separate answers as needed.) OB. There are no critical points for f(x) x - 256/x on the domain

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