Solve the Problem $g ( x ) = x ^ { 2 } - 3 x - 18$

Multiple Choice

Solve the problem.
-If $g ( x ) = x ^ { 2 } - 3 x - 18$ , solve $g ( x ) \leq 0$ .

A) $[ - 3,6 ]$
B) $( - \infty , - 3 ]$
C) $( - \infty , - 3 ]$ or $[ 6 , \infty )$
D) $[ 6 , \infty )$