Circle

From the equation of a circle:

2x2+2y2+20x20y+68=0


Calculate the coordinates of the center of the circle S[x0, y0] and radius of the circle r.

Correct result:

x0 =  -5
y0 =  5
r =  4

Solution:

(xx0)2+(yy0)2=r2 (x+5)2+(y5)2=42  x0=5 y0=5 r=4



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