Solve $6 x ^ { 2 } + 12 x + 5 = 0$

Multiple Choice

Solve $6 x ^ { 2 } + 12 x + 5 = 0$ by the quadratic formula.

A) $\left\{ \frac { - 6 \pm \sqrt { 6 } } { 6 } \right\}$
B) $\{ - 1 \pm \sqrt { 6 } \}$
C) $\left\{ \frac { 6 \pm \sqrt { 6 } } { 6 } \right\}$
D) $\{ \pm \sqrt { 6 } \}$