# How do you find the center and radius for #x^2+y^2 +2x-4y=4#?

##### 1 Answer

May 30, 2016

Put the equation into standard form to find it to be a circle with radius

#### Explanation:

In order to put the equation of a conic section into standard form (at which point we can see most of its properties), we use a process called completing the square on both variables.

The standard form of the equation of a circle with radius

Thus, as our equation may be written as

it represents a circle of radius