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5 March, 10:23

What is the center of the circle x2 + y2 + 11x + 18 = 0?

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  1. 5 March, 12:13
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    ( - 5.5, 0) is the center

    Step-by-step explanation:

    center (h, k)

    Circle: (x-h) ² + (y-k) ² = r²

    x² + y² + 11x + 18 = 0

    (x² + 11x + 5.5²) + (y - 0) ² = 5.5² - 18

    (x + 5.5) ² + (y - 0) ² = 12.25

    (x - (-5.5)) ² + (y - 0) ² = 3.5²

    h = - 5.5 K = 0 r = 3.5
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