Tell What the Output Value Is for the Function Machine $- 6$

Multiple Choice

Tell what the output value is for the function machine for an input of $- 6$

A) $f ( - 6 ) = - 21$
B) $f ( - 6 ) = - 6$
C) $f ( - 6 ) = - 14$
D) $f ( - 6 ) = - 42$
E) $f ( - 6 ) = 6$