A parabola has a vertex at open paren 0 comma 0 close paren The focus of the parabola is located on the positive x -axis. Which part of the graph will the directrix pass through?

A parabola’s directrix is perpendicular to the line from its vertex to its focus and lies on the opposite side of the vertex from the focus. Since the focus is on the positive x-axis and the vertex is at the origin, the directrix is a vertical line to the left of the origin, so it passes through the negative part of the x-axis. The correct choice is “the negative part of the x-axis.”

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