Question 1077798
The form we are looking for is  {{{ (x-h)^2 + (y-k)^2 = r^2 }}}
    where (h,k) is the center
    and  r is the radius

We know the center, let's find the radius:

  {{{ r^2 = (2-(-1))^2 + (5-9)^2) = 9+16 = 25 }}}


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Ans:   {{{ (x+1)^2 + (y-9)^2 = 25 }}}            
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(x+1)^2 + (y-9)^2 = 25