Respuesta :

The answer should be the directrix because k represents the y-value of the vertex, and for this questions the parabola is probably facing upward, so the directrix is under the vertex.

Answer:

The line y=k-1/4a represent in y=a(x-h)^2+k is:

                                   Directrix.              

Step-by-step explanation:

Directrix of a parabola--

A directrix is a line which is perpendicular to the axis of symmetry of a parabola and it does not touch the parabola.

Also, for the standard equation of the parabola i.e.

                          [tex]y=a(x-h)^2+k[/tex]

The equation of directrix of a parabola is given by:

                    [tex]y=k-\dfrac{1}{4a}[/tex]

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