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12 November, 02:31

Find the Center and the radius of the circle

x2 + y2 - 6x + 8y - 7 = 0.

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  1. 12 November, 02:39
    0
    C (3,-4), r=4*sqrt (2)

    Step-by-step explanation:

    C (p, q)

    x^2+y^2+dx+ey+f=0

    p=-d/2, q=-e/2, r^2=p^2+q^2-f

    x^2+y^2 - 6x+8y-7=0

    p = - (-6) / 2=6/2=3

    q=-8/2=-4

    r^2=3^2 + (-4) ^2+7

    r^2=9+16+7

    r^2=32

    r=sqrt (32)

    r=sqrt (16*2)

    r=4*sqrt (2)
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