Solve by Completing the Square $$x ^ { 2 } + 16 x = - 43$$

Multiple Choice

Solve by completing the square.
- $$x ^ { 2 } + 16 x = - 43$$

A) $\{ 8 - \sqrt { 43 } , 8 + \sqrt { 43 } \}$
B) $\{ - 16 + \sqrt { 43 } \}$
C) $\{ 8 + \sqrt { 21 } \}$
D) $\{ - 8 - \sqrt { 21 } , - 8 + \sqrt { 21 } \}$