9000105407

SubArea: 
Level: 
Project ID: 
9000105407
Source Problem: 
Accepted: 
1
Clonable: 
1
Easy: 
0
Parabola is a set of points that are equidistant from the point (focus) and the line (directrix). Find the equation of the directrix of the parabola \(y^{2} + 6y - 12x + 21 = 0\).
\(x + 2 = 0\)
\(x - 5 = 0\)
\(y + 3 = 0\)
\(y - 1 = 0\)