Evaluate the Indicated Function For $f ( x ) = x ^ { 2 } + 3$

Multiple Choice

Evaluate the indicated function for $f ( x ) = x ^ { 2 } + 3$ and $g ( x ) = x - 6$ .​ $( f - g ) ( 0 )$ ​ ​

A) 48
B) 39
C) 9
D) 0
E) -39