Find the radius of the circle given by x2-10x+y2+8y=18. Round to 1 decimal place
x^2-10x+y^2+8y=18 complete the square on x, y
x^2 -10x + 25 + y^2 + 8y + 16 = 18 + 25 + 16
(x - 5)^2 + (y + 4)^2 = 59
The radius = sqrt (59) ≈ 7.7 units
+295 
