Solve the Equation by Completing the Square $$z ^ { 2 } + 10 z + 4 = 0$$

Multiple Choice

Solve the equation by completing the square.
- $$z ^ { 2 } + 10 z + 4 = 0$$

A) $5 \pm \sqrt { 4 }$
B) $5 + \sqrt { 21 }$
C) $- 5 \pm \sqrt { 21 }$
D) $- 10 + \sqrt { 4 }$