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btobislifeu
The answer is x^2 + y^2 = 9

For this problem, you should use the equation of circle:

(x - h) ^2 + (y - k)^2 = r^2

where (h,k) is the coordinates of the center
and r is radius

(x - 0) ^2 + (y - 0)^2 = 3^2

Therefore:

x^2 + y^2 = 9

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