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13 September, 01:20

Part a) Write the equation of the circle by completing the square.

Part b) What is the center and the radius of the circle?

x2 + 4x + y2 - 2y = 20

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  1. 13 September, 01:43
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    Hello:

    x² + 4x + y² - 2y = 20

    x² + 4x+4-4 + y² - 2y+1-1 = 20

    (x² + 4x+4) - 4 + (y² - 2y+1) - 1 = 20

    (x+2) ² + (y-1) ² = 5²

    the radius is : 5 the center: (-2,1)
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