Solve the Equation $8 x ^ { 2 } - 2 x - 21 = 0$

Solve the equation. $8 x ^ { 2 } - 2 x - 21 = 0$

A) $\left\{ \frac { 3 } { 2 } , - \frac { 7 } { 4 } \right\}$
B) $\left\{ - \frac { 3 } { 2 } , \frac { 7 } { 4 } \right\}$
C) $\left\{ - \frac { 3 } { 2 } , - \frac { 7 } { 4 } \right\}$
D) $\left\{ - \frac { 3 } { 2 } , \frac { 4 } { 7 } \right\}$
E) $\left\{ \frac { 3 } { 2 } , \frac { 7 } { 4 } \right\}$

Correct Answer:

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