Level:
Project ID:
2010006307
Source Problem:
Accepted:
0
Clonable:
1
Easy:
0
The equation of a parabola is given by \( 4x^2+16x-y+18=0 \). Find the equation of its directrix.
\( x=\frac{31}{16} \)
\( x=-\frac{33}{16} \)
\( x=\frac{33}{16} \)
\( x=-\frac{31}{16} \)
\( x=\frac{15}{8} \)