Question

Give the equation for a circle with the given center and radius. Center at (2, -9), radius = 3

Answer 1

The correct equation is (x-2)^2+(y+9)=9

Answer 2

In standard form, the equation is
`(x-2)^2+(y+9)^2=9,` where we have plugged
`(h,k,r)=(2,-9,3)` into the standard-form equation
`(x-h)^2+(y-k)^2=r^2.` The center of this general form has coordinates
`(h,k),` and the radius is
`r.`