# How do you find the center and radius of the circle given #x^2+y^2+9x-8y+4=0#?

##### 1 Answer

Dec 18, 2016

The center is

#### Explanation:

We complete the squares and rearrange the equation

And now we factorise

We compare this equation to the standard equation of a circle

The centre is

In our case,

The center is