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Thread: circles

  1. January 24th 2009, 11:41 AM #1
    Yup318
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    circles

    I need some help with a problem.If someone could explain on how to solve

    Find the center and radius of the circle

    x2 + y2 - 2x =0

    I already have the answers (1,0) r=1

    I'm just confused on how to go about solving. I know I use the formula

    (x-h)2 + (y-k) = r2

    I'm just confused on the complete the square part, any help is appreciated!
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  2. January 24th 2009, 11:43 AM #2
    vincisonfire
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    You must complete the square for x and y x^2 + y^2 - 2x = x^2 - 2x +1 - + y^2 = (x-1)^2 + y^2 -1 = 0
    (x-1)^2 + (y-0)^2 = 1
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