Question: At what point(s) does the graph of the function shown below have a horizontal tangent? x2+y2= -16x There is a horizontal tangent at the point(s)

At what point(s) does the graph of the function shown below have a horizontal tangent? x2+y2= -16x There is a horizontal tangent at the point(s) E. (Type an ordered pair. Use a comma to separate answers as needed.)
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