Question

Find the center and the radius of the circle: x2 - 6x + y2 + 1 = 0.

Answer 1

(x-3)^2+y^2 +1-9=0

Answer 2

so r = sqrt(8)

Answer 3

how about to center though, thats what im having trouble with

Answer 4

isn't it obvious now?

Answer 5

(x-z)^2+(y-b)^2 = r^2
standard form where (a,b) is center you solve now