Solve the Equation by Completing the Square $$x ^ { 2 } - 8 x - 7 = 0$$

Multiple Choice

Solve the equation by completing the square.
- $$x ^ { 2 } - 8 x - 7 = 0$$

A) $\{ 4 - \sqrt { 23 } , 4 + \sqrt { 23 } \}$
B) $\{ - 4 - \sqrt { 23 } , - 4 + \sqrt { 23 } \}$
C) $\{ 8 - \sqrt { 71 } , 8 + \sqrt { 71 } \}$
D) $\{ 4 - \sqrt { 7 } , 4 + \sqrt { 7 } \}$