The general equation of parabola with vertex (h,k) is,
[tex](x-h)^2=4p(y-k)[/tex]The quation of directrix for the given parabola is,
[tex]y=k-p[/tex]On comparing the given equation with general equation,
h = 1, k = -2 and 4p = 12.
Determine the value of p.
[tex]\begin{gathered} 4p=12 \\ p=3 \end{gathered}[/tex]Determine the equation of directric for given parabola.
[tex]\begin{gathered} y=-2-3 \\ y=-5 \end{gathered}[/tex]So answer is y = -5.
Option A is correct.
