Solve the Polynomial Inequality $$2 x ^ { 2 } - 17 x \leq - 21$$

Multiple Choice

Solve the polynomial inequality. Write the answer in interval notation. $$2 x ^ { 2 } - 17 x \leq - 21$$

A) $\left[ \frac { 3 } { 2 } , 7 \right]$
B) $\left( - \infty , \frac { 3 } { 2 } \right) \cup ( 7 , \infty )$
C) $\left[ - 7 , - \frac { 3 } { 2 } \right]$
D) { }