# How do you find the center and radius of the circle #x^2+y^2-4x+8y-5=0 #?

##### 1 Answer

Aug 25, 2016

Radius:

Center:

#### Explanation:

Do a double completion of square; the x's with the x's and the y's with the y's.

In the form

Hence, the centre is at

Hopefully this helps!