Find the Vertex by Using the Vertex Formula $$f ( x ) = x ^ { 2 } + 10 x - 6$$

Multiple Choice

Find the vertex by using the vertex formula. $$f ( x ) = x ^ { 2 } + 10 x - 6$$

A) $\left( - 5 , \frac { 11 } { 4 } \right)$
B) $( 10 , - 6 )$
C) $( - 5 , - 31 )$
D) $( - 10,6 )$