Hi,
You need to complete the square for both and :
Can you take it from there?
rearrange this equation to show the centre-radius form of the equation of a circle. State the coordinates of the center and the radius of the circle
9y^2 + 7x^2 + 35 = 8x - 2x^2 - 36y
So far i have...
9y^2 + 7x^2 + 35 = 8x - 2x^2 - 36y
9x^2 - 8x + 9y^2 + 36y + 35 = 0
x^2 - (8/9)x + y^2 + 4y = -35/9
just a bit stuck now....