Solve the Equation by the Zero-Factor Property $$2 x ^ { 2 } = 21 x - 49$$

Multiple Choice

Solve the equation by the zero-factor property.
- $$2 x ^ { 2 } = 21 x - 49$$

A) $\left\{ - 7 , - \frac { 7 } { 2 } \right\}$
B) $\left\{ \frac { 7 } { 2 } , 7 \right\}$
C) $\left\{ - 7 , \frac { 7 } { 2 } \right\}$
D) $\{ 7,14 \}$