What is the equation of a circle with center (2,-8) and radius 9?

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

Step-by-step explanation:

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

x2+y2-4x+16y-13

Step-by-step explanation:

center (h,k)=2,-8

radius(r)=9

we know

(x-h)2+(y-k)2=r2

now insert above given information

(x-2)2+(y+8)2=9×9

answer: i don't understand. what are the options

step-by-step explanation:

i think the answer is b.

step-by-step explanation:

not 100% sure though.