# How do you find the center and radius for #x^2+y^2+x-6y+9=0#?

##### 1 Answer

Oct 28, 2016

center =

radius =

#### Explanation:

We have the equation,

When a circle is in this form we must complete the square in order to put in a usable format. like,

where the centre is at

So rearrange,

And complete the square,

Rearrange,

So from this equation, we know that our circle centre is at,

and the radius of our circle is,