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SAT - Math - Coordinate geometry

The equation above defines a circle in the xy-plane. What are the coordinates of the center of the circle?

x2 20x y2 16y = −20

The equation above defines a circle in the xy-plane. What are the coordinates of the center of the circle?
A) (−20,−16)
B)(−10, −8)
C) (10, 8)
D) (20,16)

x2 + 20x + y2 + 16y = −20

Writing the equation in standard form

x+ 20x + y2 + 16y + 20 = 0

for a circle x2 + y2 + 2gx + 2hy + d = 0 center is (-g, -h)

center of the circle would be: (-10, -8)