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CGP EDU Academic Team
Published on: August 13, 2026
If focal chord of the parabola y 2 = ax is 2x – y – 8 = 0 then the equation of directrix is
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A
Since focal chord of parabola y 2 = ax is
2x – y – 8 = 0, so the chord will pass through the focus
∴ 2 
– 0 – 8 = 0 ∴ a = 16
∴ directrix x + 4 = 0
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