Solve the Equation by Completing the Square $$x ^ { 2 } + 4 x + 3 = 0$$

Multiple Choice

Solve the equation by completing the square.
- $$x ^ { 2 } + 4 x + 3 = 0$$

A) $\{ - 1 , - 3 \}$
B) $\{ 1 , - 1 \}$
C) $\{ 6 , - 3 \}$
D) $\{ 1,3 \}$