4. X2 + Y2 + 16x - 10y +81 = 0

4. x2 + y2 + 16x - 10y +81 = 0

  (x2 +16x) + (y2-10y)=-81
(x2+16+64) + (y2-10y+25)= -81+64+25
(x+8)^2 +(y-5)^2= 8

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