Rewrite the Quadratic Function in Standard Form by Completing the Square

Multiple Choice

Rewrite the quadratic function in standard form by completing the square.
- $$f ( x ) = x ^ { 2 } + 6 x - 4$$

A) $f ( x ) = ( x + 6 ) ^ { 2 } - 40$
B) $f ( x ) = ( x + 3 ) ^ { 2 } + 13$
C) $f ( x ) = ( x + 3 ) ^ { 2 } - 13$
D) $f ( x ) = ( x + 6 ) ^ { 2 } + 40$