+0  
 
0
764
1
avatar+164 

The equation of a circle is x2+4x+y2−10y+13=0 .

 

What is the equation of the circle in standard form?

 

A.)    (x+2)2+(y−5)2=25

 

B.)    (x+4)2+(y−25)2=25

 

C.)    (x+2)2+(y−5)2=16

 

D.)    (x+4)2+(y−25)2=16

Gwendolynkristine  Jun 5, 2017
 #1
avatar+7324 
+3

x2 + 4x + y2 - 10y + 13  =  0

 

Subtract 13 from both sides of the equation.

 

x2 + 4x + y2 - 10y  =  -13

 

Add (4/2)2 , or 4, and (10/2)2 , or 25, to both sides of the equation.

 

x2 + 4x + 4 + y2 - 10y + 25  =  -13 + 4 + 25

 

Now we can factor the x part and y part like this....

 

(x + 2)2 + (y - 5)2  =  16

hectictar  Jun 5, 2017

31 Online Users

avatar
avatar

New Privacy Policy

We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive information about your use of our website.
For more information: our cookie policy and privacy policy.