Additional Concepts
- $x ^ { 2 } + 2 x y + y ^ { 2 } - 8 x + 8 y = 0$

Multiple Choice

Additional Concepts
- $x ^ { 2 } + 2 x y + y ^ { 2 } - 8 x + 8 y = 0$ ; Find the coordinates of the vertex.

A) $( 0,0 )$
B) $( - \sqrt { 2 } , 0 )$
C) $( 2,0 )$
D) $( - 2,0 )$