Long description: fig5

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A graph showing the shape of a parabola opening to the right, labeled with the terms focus and directrix.

Alt text: A graph showing the shape of a parabola opening to the right, labeled with the terms focus and directrix.

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  • The image displays a Cartesian coordinate system with a horizontal axis labeled with \(x\) and a vertical axis labeled with \(y\).
  • The graph features a curve resembling a parabola opening towards the positive \(x\) direction.
  • On the horizontal axis, the point labeled \(-a\) indicates the position of the directrix, which is depicted as a vertical line at \(x = -a\).
  • On the horizontal axis, the point labeled \(a\) indicates the position of the focus.
  • The curve itself is drawn such that it passes through the vertical line labeled "directrix" and opens towards the positive \(x\) direction, with the focus labeled "focus" shown inside the curve's opening.

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