Question

Check?

Find the center and radius of the given circle

1. x^2+y^2+10y+21=0

= 5

Answer 1

Correct.

Answer 2

Radius is 5 at least. (1,5) is center

Answer 3

Howzat?

x^2 + (y+5)^2 = 4
center is at (0,5), radius is 2