Solve the Equation Using the Quadratic Formula $( 2 x - 1 ) ( x + 1 ) = 6$

Solve the equation using the quadratic formula.
- $( 2 x - 1 ) ( x + 1 ) = 6$

A) $\left\{ \frac { - 1 \pm \sqrt { 57 } } { 4 } \right\}$

B) $\left\{ \frac { 1 \pm \sqrt { 57 } } { 2 } \right\}$

C) $\left\{ \frac { - 1 \pm \sqrt { 17 } } { 2 } \right\}$

D) $\left\{ \frac { 1 \pm \sqrt { 57 } } { 4 } \right\}$

Correct Answer:

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