find the equation of the circle through the intersection of the circles x2+y2-8x-2y+7=0 and x2+y2-4x+10y+8=0 and passing through the point (-1,-2)

Hi, 
The required circle would be x2+y2-8x-2y+7+λx2+y2-4x+10y+8= 0 Now since it passes through -1,-2put x = -1 and y = -2 and find λ and put back the value of λ to find the requied circle.  
Regards

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