Evaluate the Polynomial Function $f ( x ) = x ^ { 2 } - 7 x + 9$

Multiple Choice

Evaluate the polynomial function.
-If $f ( x ) = x ^ { 2 } - 7 x + 9$ , find $f ( a + 3 )$ .

A) $a ^ { 2 } - 1 a + 21$
B) $a ^ { 2 } - 7 a - 3$
C) $a ^ { 2 } - 1 a - 3$
D) $a ^ { 2 } - 7 a + 6$