# How do you find the center and radius of the circle with this equation #x^2 + y^2 – 8x – 20y + 80 = 0#?

##### 1 Answer

Jan 18, 2016

The centre is

#### Explanation:

You would have to complete the square twice, once for x and once for y, in order to write in in standard form

Completing the square to write it in this form yields :

Hence the centre is