what is the radius?
x^2+y^2-2x+6y+9=0

Question

what is the radius?
x^2+y^2-2x+6y+9=0

anonymous · Answer

$$\sqrt{9}=?$$

usukidoll · Answer

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

freckles · Answer

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

usukidoll · Answer

OH right forgot that @freckles

anonymous · Answer

oh yes.

anonymous · Answer

the answer is 1 thank you all though :)

usukidoll · Answer

how did you get 1?

anonymous · Answer

graphing calculator perhaps

usukidoll · Answer

or desmos/wolfram alpha XDDDDDDDDDDDDD

anonymous · Answer

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

anonymous · Answer

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

anonymous · Answer

thats why we never get mcq for test

usukidoll · Answer

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

usukidoll · Answer

mcq? @saseal

anonymous · Answer

multiple choice questions

usukidoll · Answer

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

anonymous · Answer

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

anonymous · Answer

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

irishboy123 · Answer

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
$[(x-1)^2 -1] +[(y +3)^2 - 9] +9=0$