Find the center (h,k) and radius

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Find the center (h,k) and radius r of the circle and then use these to (a) graph the circle and (b) find the intercepts, if any.
3x^2+36x+3y^2=0

  • Find the center (h,k) and radius -

    3x^2+36x+3y^2=0
    x^2+12x+y^2=0
    (x^2+12x+36) + y^2 = 36
    (x+6)^2 + y^2 = 36

    hat should make it easy to get the required info.

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