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Consider the function f(x) - x x2+ 4. Enter the number of critical pointsumbers of f(x). Determine the x-coordinates of the critical points. Enter your answer as a comma-separated list of values. The order of the values does not matter. Enter DNE if f(x) does not have any critical points. 12. [-/1 Points] DETAILS MY NOTES Math 110 Course Resources - Curve Sketching Course Packet on critical points Consider the function f(x) - 9V x - + 8. 5 Enter the number of critical pointsumbers of f(x). Determine the x-coordinates of the critical points. Enter your answer as a comma-separated list of values. The order of the values does not matter. Enter DNE if f(x) does not have any critical points