## anonymous one year ago what is the radius? x^2+y^2-2x+6y+9=0

1. anonymous

$\sqrt{9}=?$

2. UsukiDoll

maybe it helps to rearrange this equation first and then have it in the equation of the circle format.

3. freckles

completing the square needs to be done for the x and y terms separately of course

4. UsukiDoll

OH right forgot that @freckles

5. anonymous

oh yes.

6. anonymous

the answer is 1 thank you all though :)

7. UsukiDoll

how did you get 1?

8. anonymous

graphing calculator perhaps

9. UsukiDoll

or desmos/wolfram alpha XDDDDDDDDDDDDD

10. anonymous

$(x^2-2x)+(y^2+6y)=-9$

11. anonymous

i didnt but i got answer wrong and the test said the correct anwer was 1 lol

12. anonymous

thats why we never get mcq for test

13. UsukiDoll

<_< yeah that's why I asked... you need to understand the concepts of this so you can be able to solve these equations

14. UsukiDoll

mcq? @saseal

15. anonymous

multiple choice questions

16. UsukiDoll

oh XD. Come to think of it, it's been years since I had one

17. anonymous

@grecar98 take that equation i gave ya and complete the square

18. anonymous

time for me to learn bitumen road making...afk!

19. IrishBoy123

as the OP has found the answer: $$x^2+y^2-2x+6y+9=0$$ rearrange $$x^2 - 2x +y^2+6y+9=0$$ complete squares $$[(x-1)^2 -1] +[(y +3)^2 - 9] +9=0$$