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Math

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The equation of a circle is x^2-6x+y^2+2y=15
what is the center and the radius?

  • Math -

    factor it as perfect squares

    x^2-6x + 9 + y^2+2y + 1= 15+9+1
    (x-3)^2 + (y+1)^2=25
    so center is 3,1 and radius is 5

  • Math -

    oops, center 3,-1

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