<PRE><B>Question 519085</B>
Find the center and exact radius (no non-terminating decimal places) of this circle:  x^2 + y^2 - 10x +4y + 7 = 0
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Complete the squares.
x^2 - 10x + y^2 +4y = - 7
x^2 - 10x + 25 + y^2 + 4y + 4 = - 7 + 25 + 4
(x-5)^2 + (y+2)^2 = 25
Center at (5,-2)
r = 5

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