x2 + y2 + 2x + 22y + 99= 0 complete the square to write the standard form equation of each circle, identify the center and radius)

Answer 1

x^2 + 2x + 1 + y^2 + 22y + 121 = 1+121 -99

(x+1)^2 + (y+11)^2 = 23

center is (-1,-11) with radius sqr23 = about 4.8

Answer 2

x^2+2x+ y^2+22y = -99

x^2+2x+1+y^2+22y+121 = -99 +1+121

(x+1)^2 + (y+11)^2 = 23

(-1,-11) is the center

sqrt(23) is the radius