Evaluate the Expression $\frac { - 2 \pm \sqrt { 2 ^ { 2 } - 4 ( 1 ) ( - 8 ) } } { 2 ( 1 ) }$

Evaluate the expression. $\frac { - 2 \pm \sqrt { 2 ^ { 2 } - 4 ( 1 ) ( - 8 ) } } { 2 ( 1 ) }$