Write an equation of the circle with center (8,-9) and radius 6.

Answer 1

(x-8)^2 + (y+9) = 36

right hand side is the square of the radius = 6x6 = 36

x-8 means 8 is the x coordinate of the center

y+9 means -9 is the y coordinate of the center

just change the sign and add x or y

you can simplify if you want, expand and collect the constant terms into just one constant