Published by:
CGP EDU Academic Team
Published on: August 14, 2026
The parabola (y - 1) 2 = a(x - 2) passes through the point
(1, -2). The equation of its directrix is
Text Solution
Verified by ExpertsThe correct answer is:
D
Since (y – 1) 2 =a(x=2) passes through the point (1, -2)
(-2-1) 2 = a(1 – 2) ⇒ ⇒ a = - 9.
The given parabola is (y – 1) 2 = -9(x – 2) but the equation of directrix of the parabola (y- β β ) 2 = 4a(x- α α ) is x- α α = -a.
∴ ∴ The directrix of (y – 1) 2 = -9(x- α α ) is (x – α α ) = 
⇒ ⇒ 4x
= 17.
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