If the equation of a circle is x 2+y…… 2+kx+2y+k…… 2 = Oh, then when the area of the circle is the largest, the coordinates of the center of the circle are
(x+k/2)^2+(y+1)^2=1-3k^2/4
So k = 0 has the largest area
The center of the circle is (0, - 1)
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