Verified answer

The general formula for a circle is:

(x-h)² + (y-k)² = r²

h & k are the center points, r is the radius

Inserting your values:

(−8, −13) and has a radius of 13

Note: be careful with the signs!

(x +8)² + (y +13)² = 169

[ x + 8 ]² + [ y + 13 ]² = 169

(x+8)^2 + (y+13)^2 = 13^2