Desmos Parabola Focus Directrix. The parabola will open upward because the directrix y -2 and the vertex 61 of the parabola is located below the focus. Perpendicular to the axis of symmetry the focus and directrix are equidistance from the vertex.
Comment on George Winslows post Correct. Be sure to use the graphing box given and make sure a significant amount of the parabola shows on graph. If the parabola opens to the right the directrix is to the left of the vertex and if the parabola opens to the left then the directrix is to the right of the vertex.
The directrix of the parabola is the horizontal line on the side of the vertex opposite of the focus.
If the parabola opens to the right the directrix is to the left of the vertex and if the parabola opens to the left then the directrix is to the right of the vertex. X p 2 3. Type your response here. This MATHguide video explains details the characteristics of a parabola namely the relationship between the directrix focus and vertex.
