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# centre and radius of a circle watch

1. Can someone please explain to me how do i fond the centre and radius of this circle:

x^2+6x+y^2-2y=15
2. (Original post by kyra.wilson)
Can someone please explain to me how do i fond the centre and radius of this circle:

x^2+6x+y^2-2y=15
Complete the square to obtain the standard form for the equation of a circle.
3. (Original post by Mr M)
Complete the square to obtain the standard form for the equation of a circle.
thank you so much this has really helped

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