` x^(2) + 30x + 221 = 0`
` y^(2) - 53y+196 = 0`

2x^(2) - 15x + 28 = 0 4y^(2) - 23y+30 = 0

I. 20x^(2) + 9x+1 = 0" " II. 30y^(2) + 11y + 1= 0

Show that the circles x^(2) + y^(2) + 2x = 0 and x^(2)+ y^(2) - 6 x -6 y + 2 = 0 touch externally at the point (1/5,3/5)

The radical centre of the circles x^(2) + y^(2)- 2x + 6y = 0 , x^(2) + y^(2) - 4x - 2y + 6 = 0 , x^(2) + y^(2) - 12x + 12y + 30 = 0 is

I. x^(2)+8x+15 = 0 II. y^(2) + 11y + 30 = 0

x^(2) + x-20= 0, y^(2)-y-30=0