Find the critical points of the following function. 2x f(x) = - x² +4 2x What is the derivative of f(x) = -? x2 +4 - 2x2 +8 f'(x) = (? +4)2 Select thè correct choice below and, if necessary, fill in the answer box to complete your choice. A. The critical point(s) occur(s) at x=. (Use a comma to separate answers as needed.) B. There are no critical points.

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