Q4 B of 18 Page 741

Find the coordinates of the focus and the vertex, the equations of the directrix and the axis, and length of the latus rectum of the parabola :

x2 = -18y


Given equation : x2 = - 18y


Comparing given equation with parabola having equation,


x2 = - 4ay


4a = 18


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Focus : F(0,-a)


Vertex : A(0,0) = A(0,0)


Equation of the directrix : y - a=0


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Lenth of latusrectum : 4a = 18



More from this chapter

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3 C

Find the coordinates of the focus and the vertex, the equations of the directrix and the axis, and length of the latus rectum of the parabola :

3x2 = 8y


 4 A

Find the coordinates of the focus and the vertex, the equations of the directrix and the axis, and length of the latus rectum of the parabola :

x2 = -8y


 4 C

Find the coordinates of the focus and the vertex, the equations of the directrix and the axis, and length of the latus rectum of the parabola :

3x2 = -16y


 5

Find the equation of the parabola with vertex at the origin and focus at F(-2, 0).