Find the vertex, the focus and directix of the following Parabolas:

(a) $y^{2}=12 x$

Vertex : Focus :

Directrix :
$y =$ or $x =$ enter answer in appropriate box, enter "NA" in other.

(b) $x^{2}=-24 y$

Vertex :
Focus :
Directrix : Directrix :
$y =$ or $x =$ enter answer in appropriate box, enter "NA" in other.