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16 February, 14:47

X2 + y2 - 20x + 14y + 28 = 0 is a circle. What is the radius of this circle?

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  1. 16 February, 16:03
    0
    11

    Step-by-step explanation:

    observe the equation equivalent to

    x² - 20x + 100 + y² + 14y + 49 = 121

    (x-10) ² + (y+7) ² = 11²

    so the circle has radius 11
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