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If the line x - 1 = 0 is the directrix of the parabola y^2 + kx + 8 = 0, then one of the values of k is

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If the line x - 1 = 0 is the directrix of the parabola y2 + kx + 8 = 0, then one of the values of k is

(a) 1/8

(b) 8

(c) 4

(d) 1/4

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1 Answer

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Best answer

Correct option: (c) 4

Explanation:

Given, y2 + kx + 8 = 0

=> y2 = k(x - 8/k)

Shifting the origin

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