Question

write in complete standard form then give the center and radius of each circle and graph the equation x2+y2-4x-12y-9=0

Answer 1

standard form;

(x - 2)² + (y - 6)² = 49

the center-radius form of the circle equation is in this format;

(x - h)² + (x - k)² = r²

so the center of the circle is; (2, 6)
so the radius of the circle is; 7

hope that helps, God bless!