Find the Vertex and Axis of Symmetry of the Graph $$f ( x ) = x ^ { 2 } + 6 x$$

Multiple Choice

Find the vertex and axis of symmetry of the graph of the function.
- $$f ( x ) = x ^ { 2 } + 6 x$$

A) $( 3 , - 9 ) ; x = 3$
B) $( 9 , - 3 ) ; x = 9$
C) $( - 9,3 ) ; x = - 9$
D) $( - 3 , - 9 ) ; x = - 3$