Question #b62d0

${x}^{2}$+ ${y}^{2}$=170 and radius=$\sqrt{170}$
The formula for a circle is ${\left(x - h\right)}^{2} + {\left(y - k\right)}^{2} = {r}^{2}$ , where (h,k) is the coordinates for the center, and r is the radius. To find the radius just find the distance between the point (7,-11) to (0,0) using distance formula or Pythagorean theorem to get $\sqrt{170}$, then plug that into the circle formula.