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If the line x-1=0 is the directrix of th...

If the line x-1=0 is the directrix of the parabola `y^(2)-kx+8=0`, then value(s) of k is/are

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If the line x-1=0 is the directrix of the parabola y^2-k x+8=0 , then one of the values of k is (a) 1/8 (b) 8 (c) 4 (d) 1/4

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