Solve the Equation by Completing the Square $$x ^ { 2 } + 8 x = 5$$

Multiple Choice

Solve the equation by completing the square.
- $$x ^ { 2 } + 8 x = 5$$

A) $\{ - 4 - \sqrt { 21 } , - 4 + \sqrt { 21 } \}$
B) $\{ - 1 - \sqrt { 21 } , - 1 + \sqrt { 21 } \}$
C) $\{ - 4 - 2 \sqrt { 21 } , - 4 + 2 \sqrt { 21 } \}$
D) $\{ 4 + \sqrt { 21 } \}$