What is the center of the circle x2 + y2 + 11x + 18 = 0?

( - 5.5, 0) is the center

Step-by-step explanation:

center (h, k)

Circle: (x-h) ² + (y-k) ² = r²

x² + y² + 11x + 18 = 0

(x² + 11x + 5.5²) + (y - 0) ² = 5.5² - 18

(x + 5.5) ² + (y - 0) ² = 12.25

(x - (-5.5)) ² + (y - 0) ² = 3.5²

h = - 5.5 K = 0 r = 3.5