Determine the Constant That Should Be Added to the Binomial $$x ^ { 2 } + 8 x = 7$$

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.
- $$x ^ { 2 } + 8 x = 7$$

A) $\{ - 4 - \sqrt { 11.5 } , - 4 + \sqrt { 11.5 } \}$
B) $\{ 4 + \sqrt { 11.5 } \}$
C) $\{ - 1 - \sqrt { 11.5 } , - 1 + \sqrt { 11.5 } \}$
D) $\{ - 4 - 1 \sqrt { 11.5 } , - 4 + 1 \sqrt { 11.5 } \}$