Use the Method of Completing the Square to Solve the Quadratic

Multiple Choice

Use the method of completing the square to solve the quadratic equation. $3 x ^ { 3 } + 7 x - 1 = 0$

A) $x = \frac { - 7 + \sqrt { 61 } } { 2 }$
B) $x = \frac { - 7 \pm \sqrt { 61 } } { 6 }$
C) $x = \frac { \pm 7 \pm \sqrt { 61 } } { 2 }$
D) $x = \frac { \pm 7 + \sqrt { 61 } } { 2 }$
E) $x = \frac { \pm 7 \pm \sqrt { 61 } } { 6 }$