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15 December, 21:56

The equation x2-8x+y2=9 defines a circle in the xy-coordinate plane. What is the radius of the circle

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  1. 15 December, 22:19
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    X² - 8x + y² = 9

    (x² - 8x + 16) + y² = 9 + 16

    (x - 4) ² + y² = 25

    (x - 4) ² + y² = 5²

    he radius is equal to 5.
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