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18 February, 16:00

What is the radius of the circle given by the equation below?

x2 - 4x + y2 - 4y - 73 = 0

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  1. 18 February, 17:00
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    Hello:

    (x² - 4x) + (y² - 4y) - 73 = 0

    (x² - 4x+4-4) + (y² - 4y+4-4) - 73 = 0

    (x² - 4x+4) - 4 + (y² - 4y+4) - 4 - 73 = 0

    (x-2) ² + (y-2) ² = 9²

    the radius is : 9
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