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If the sum of the slopes of the lines given by $x^{2} - 2 c x y - 7 y^{2} = 0$ is four times their product, then the value of $c$ is

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Correct option is A

If m1,m2 are the slopes, then m1+m2=−2c/7,m1m2=−1/7m1+m2=4m1m2c=2

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If the sum of the slopes of the lines given by x2−2cxy−7y2=0 is four times their product, then the value of c is

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If the sum of the slopes of the lines given by $x^{2} - 2 c x y - 7 y^{2} = 0$ is four times their product, then the value of $c$ is