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Let the mirror image of a circle c1: x2 + y2 - 2x - 6y + α = 0 in line y = x + 1 be c2 : 5x2 + 5y2 + 10gx + 10fy + 38 = 0. If r is the radius of circle c2, then α + 6r2 is equal to______

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Best answer

Correct answer is 12

Image of center c1 ≡ (1,3) in x – y + 1 = 0 is given by

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