Question

Determine the center and radius of the following circle equation:
x2 + y2 - 4x + 20y + 55 = 0

Answer 1

Explanation:

x2 - 4x +4 -4 + y2 + 20y +100 -100 + 55=0

(x-2)2 + (y+10)2 =49

center:(2,-10)

r=7