Question

What is the equation of this circle?

x2 + (y + 1)2 = 4

x2 + (y – 1)2 = 2

x2 + (y + 1)2 = 2

x2 + (y – 1)2 = 4

Answer 1

since the center has moved up by 1 unit, so x^2 + (y+1)^2 = 4

Answer 2

thanks