Question
Download Solution PDFFind equation of directrix of parabola, x2 = - 22y .
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
Parabola, x2 = 4ay, where a > 0, then
Equation of directix, y + a = 0
Parabola, x2 = - 4ay, where a > 0, then
Equation of directix, y - a = 0
Calculation:
Given parabolic equation, x2 = - 22y
On comparing with standard equation, x2 = -4ay , we get a =
We know that equation of directrix, y - a = 0
⇒ y -
⇒ 2y - 11 = 0 .
The correct option is 1.
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