Complete the square and write the equation in standard form. Then give the center and radius of the circle.x2 + 18x + 81 + y2 - 8y + 16 = 81
A. (x + 9)2 + (y - 4)2 = 81
(9, -4), r = 81
B. (x - 4)2 + (y + 9)2 = 81
(4, -9), r = 9
C. (x - 4)2 + (y + 9)2 = 81
(-4, 9), r = 81
D. (x + 9)2 + (y - 4)2 = 81
(-9, 4), r = 9
Answer: D
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