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20 January, 08:35

1. The equation of a circle in general form is x2 + y2 - 6x + 4y - 86 = 0 What is the center and radius of the circle?

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  1. 20 January, 11:36
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    X² - 6x + y² + 4y = 86

    Complete the square:

    x² - 6x + (9) + y²+4y + (4) = 86 + (9) + (4)

    → (x - 3) ² + (y + 2) ² = 99

    Center: (3, - 2)

    radius: √99 = 3√11
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