Mathematics - Circle Question with Solution | TestHub

Circles are drawn through $(1,1)$ touching the circle $x^2+y^2-6x+2y+1=0$. If $r_1$ and $r_2$ are the radii of smallest and largest circles then the value of ${\left(r_2+r_1\right)}^2-{\left(r_2-r_1\right)}^2$ equals $\_\_\_\_$