Given equation : x2 = - 18y
Comparing given equation with parabola having equation,
x2 = -4ay
4a = 18
a = \(\frac{9}{2}\)
Focus: F(0,-a) = F \(\Big(0,-\frac{9}{2}\Big)\)
Vertex : A(0,0) = A (0,0)
Equation of the directrix : y - a = 0
y - \(\frac{9}{2}\) = 0
y = \(\frac{9}{2}\)
Lenth of latusrectum : 4a = 18