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If x + y = k is normal to y^2 = 12x, then k is

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If x + y = k is normal to y2 = 12x, then k is

(a) 3

(b) 9

(c) -9

(d) -3

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1 Answer

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Best answer

Correct option: (b) 9

Explanation:

If y = mx + c is normal to the parabola y2 = 4ax, then c = -2 am - am3.

From given condition, y2 = 12x

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