Determine the Constant That Should Be Added to the Binomial $x ^ { 2 } - 6 x - 7 = 0$

Multiple Choice

Determine the constant that should be added to the binomial so that it becomes a perfect square trinomial. Then
write and factor the trinomial.
- $x ^ { 2 } - 6 x - 7 = 0$

A) $\{ - 1,7 \}$
B) $\{ - 7,1 \}$
C) $\{ - \sqrt { 7 } , \sqrt { 7 } \}$
D) $\{ - 1 , - 6 \}$