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the vertex and the focus both lie on the axis of symmetry, which is perpendicular to the directrix
so in this case, the axis of symmetry is ___ x = -4 (the x-coordinate of the focus)
the vertex lies midway between the focus and the directrix ___ in this case, midway between 2 and 4 in the y-direction
so the vertex is located at ___ (-4,3)