Evaluate the Expression $\frac { - ( - 1 ) \pm \sqrt { ( - 1 ) ^ { 2 } - 4 ( 2 ) ( - 7 ) } } { 2 ( 2 ) }$

Evaluate the expression. $\frac { - ( - 1 ) \pm \sqrt { ( - 1 ) ^ { 2 } - 4 ( 2 ) ( - 7 ) } } { 2 ( 2 ) }$