` 2x^(2) - 9x+10 = 0`
` y^(2) - 18y+72 = 0`

The circles x^(2)+ y^(2) -6x-2y +9 = 0 and x^(2) + y^(2) =18 are such that they :

The circles x^(2)+ y^(2) -6x-2y +9 = 0 and x^(2) + y^(2) =18 are such that they :

Prove that the centres of the circles x^(2) + y^(2) - 10x + 9 = 0, x^(2) + y^(2) - 6x + 2y + 1 = 0 and x^(2) + y^(2) - 18x - 4y + 21 = 0 lie on a line, find the equation of the line on which they lie.

The centre of the ellipse 4x^(2) + 9y^(2) + 16x - 18y - 11 = 0 is

The centre of the ellipse 4x^(2) + 9y^(2) + 16x - 18y - 11 = 0 is

The centre of the ellipse 4x^(2) + 9y^(2) + 16 - 18y - 11 = 0 is

I. 12x^(2)+ 11x+12 = 10x^(2) + 22x II. 13y^(2) - 18y+3=9y^(2) - 10y