If 2x^2 + xy + 2y^2 + ( - 4)x + 6y - 5 = 0 is the equation of a circle then its radius is

JEE Advanced Mathematics question

If is the equation of a circle then its radius is

Answer: (D)

A circle has no term, so . The equation is , i.e.

+ - 2x + 3y - 52 = 0.

Here , so

= +-c =

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Question ID VK-108885