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

Multiple Choice

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

A) $a ^ { 2 } - 2 a + 72$
B) $a ^ { 2 } - 16 a + 72$
C) $a ^ { 2 } - 16 a + 51$
D) $a ^ { 2 } - 2 a + 81$