engineering mathematics MCQ #459

Directrix of parabola x² = 12y is:

engineering mathematics MCQ #459

  1. Question 1

    Q1. Directrix of parabola x² = 12y is:

    • A) y = 3
    • B) y = -3
    • C) x = 3
    • D) x = -3

    Answer: y = -3

    Explanation: For x² = 4py, directrix is y = -p. 4p = 12 ⇒ p = 3 ⇒ y = -3.