Given $f ( x ) = - 3 x + 7$

Multiple Choice

Given $f ( x ) = - 3 x + 7$ , find $f ( a + b )$ .

A) $- 3 a + 7 b$
B) $- 3 b + 7 a$
C) $- 3 ( a + b ) + 14$
D) $- 3 ( a + b ) + 7$
E) $- 3 ( a + b ) + 7 ( a + b )$