If $f ( x ) = 10 x + 7$ And $g ( x ) = x ^ { 2 } - 7 x$

Multiple Choice

If $f ( x ) = 10 x + 7$ and $g ( x ) = x ^ { 2 } - 7 x$ , find $( f - g ) ( x )$ .

A) $( f - g ) ( x ) = 10 x ^ { 2 } - 70 x + 7$
B) $( f - g ) ( x ) = 10 x ^ { 3 } - 63 x ^ { 2 } - 49 x$
C) $( f - g ) ( x ) = - x ^ { 2 } + 17 x + 7$
D) $( f - g ) ( x ) = x ^ { 2 } + 3 x + 7$