Solve the Equation by Completing the Square $$x ^ { 2 } + 3 x - 9 = 0$$

Multiple Choice

Solve the equation by completing the square.
- $$x ^ { 2 } + 3 x - 9 = 0$$

A) $\{ - 3 - 3 \sqrt { 5 } , - 3 + 3 \sqrt { 5 } \}$
B) $\left\{ \frac { - 3 - 3 \sqrt { 5 } } { 2 } \right\}$
C) $\left\{ \frac { 3 + 3 \sqrt { 5 } } { 2 } \right\}$
D) $\left\{ \frac { - 3 - 3 \sqrt { 5 } } { 2 } , \frac { - 3 + 3 \sqrt { 5 } } { 2 } \right\}$