If the area of the circle 7 x^2+7 y^2-7 x+14 y+k-0 is 12 \pi sq units, then the value of k is

COMEDK Exam 2012 Solved Paper

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If the area of the circle 7x2+7y2−7x+14y+k−0 is 12π sq units, then the value of k is

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