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Coordinate Geometry
Parabola, Directrix
jee_main_2026_april_8_shift_2
Grade None

Question:

The directrix of the parabola y² = 20x is:
A. x = -3
B. x = -5
C. x = -7
D. x = -9

Step-by-Step Solution

Key Concept: For y² = 4ax, directrix is x = -a.
Step 1: y² = 20x => 4a = 20 => a = 5. Step 2: Directrix = x = -a = -5.
Correct Answer: B
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