# How do you write the equation #x^2-4x+y^2+10y=-25# in standard form and find the center and radius?

##### 1 Answer

Apr 2, 2018

centre (2,-5)

radius = 2

#### Explanation:

Completing the square

Remember, whatever you do on one side you also do on the other side

which is in the general form:

so your radius is r and your centre is (h,k)

centre (2,-5)

radius = 2