The line x - 1 = 0 is the directrix of the parabola y^2 - kx + 8 = 0. Then one of the values of k is

JEE Advanced Mathematics question

The line is the directrix of the parabola . Then one of the values of is

Answer: (C)

Put , : , whose directrix is , i.e.

x = 8k -

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Question ID VK-110486