\fFind all the values efx where the tangent line is horizontal. x] = 2x3 + 3st + 192): + 4 x = D [Simplify your answer. Use a comma to separate answers as needed.) Find the point on the graph ofthe given function at which the slope of the tangent line is the given slope. x] = I")? + 2x I"; slope of the tangent line = 4 The point at which the slope of the tangent line is 4 is D. [Simplify your answer. Type an ordered pair.)