Question

Write the equation of a circle with center (2, –8) and radius 9.
(x + 2)^2 + ( y - 8 )^2=9

Answer 1

(x-2)^2+(y+8)^2=81

Explanation:

so equation of a circle standard form:

(x-h)^2+(y-k)^2=r^2

where

(h,k) are the coordinate points

so lets substitute h=2 and k=-8

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

(x-2)^2+(y+8)^2=81

Hope this helps!

Answer 2

Explanation: