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# C2 Edexcel help! watch

1. Find the centre and radius of circle with equation x2 + y2 - 6x - 2y - 6 = 0
2. (Original post by AlphaArgonian)
Find the centre and radius of circle with equation x2 + y2 - 6x - 2y - 6 = 0
What have you tried?
3. (Original post by AlphaArgonian)
Find the centre and radius of circle with equation x2 + y2 - 6x - 2y - 6 = 0
Do you know the general method of completing the square with x and y?
4. Radius √6 centre (6,-2) i think
5. complete the square with the x and y terms respectively, and move all non-variables to the RHS.

the square root of the RHS will be the radius, and the centre of the circle will be (-a, -b) where it is in the form (x + a)^2 + (y + b)^2 = r^2
6. (Original post by zetamcfc)
What have you tried?
Well I thought r would be root 6 but apparently that's wrong
7. 1 simple question and 4 helpers !!
(am I too late?)
8. (Original post by 13 1 20 8 42)
Do you know the general method of completing the square with x and y?
Ahhh that makes sense, I should've picked up on that
9. (Original post by TeeEm)
1 simple question and 4 helpers !!
(am I too late?)
Yup, but still much appreciated that you offered aid
10. (Original post by AlphaArgonian)
Yup, but still much appreciated that you offered aid
more than enough here ...
besides I just got up and it will take me at least 1 hour to start functioning ...
11. (Original post by TeeEm)
more than enough here ...
besides I just got up and it will take me at least 1 hour to start functioning ...
Lol it takes me 2-3 hours to properly wake up

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