Solve the Problem $f ( x ) = x ^ { 2 } + 3 x - 108$

Multiple Choice

Solve the problem.
-Let $f ( x ) = x ^ { 2 } + 3 x - 108$ . Find all values $x$ for which $f ( x ) = 0$ .

A) $- 12,9$
B) $- 12,1$
C) 12,9
D) $12 , - 9$