Question

Equation of directrix of parabola x² =- 8y is :

(A) y = -2

(B) y = 2

(C) x = 2

(D) x = – 2

Answer 1

Answer is (B) y = 2

Equation of parabola

x² = – 8y

⇒ x² = -4 × 2 × y

Here a = 2

By equation of directrix y = a

y = 2