+0  
 
0
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3
avatar+457 

x2 + y2 + 4x + 2y - 4 = 0

ZZZZZZ  May 16, 2018
 #1
avatar+88899 
+1

x^2  + y^2  + 4x  + 2y  - 4   = 0

 

x^2 + 4x + 4  + y^2 + 2y  + 1  =  4 + 4 + 1

 

(x + 2)^2  +  (y + 1)^2   =  9

 

The center is  ( -2, -1)  and the radius is 3

 

EDIT TO CORRECT ASLIGHT ERROR  !!!

 

 

cool cool cool

CPhill  May 16, 2018
edited by CPhill  May 16, 2018
 #2
avatar+457 
+1

Thanks! laugh

ZZZZZZ  May 16, 2018
 #3
avatar+9552 
+1

r2=9

The radius is 3. 

laugh

Omi67  May 16, 2018

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