An Important Calculation in Calculus Is the Evaluation of the Expression

Multiple Choice

An important calculation in calculus is the evaluation of the expression $$\frac { f ( x + h ) - f ( x ) } { h } , \text { where } h \neq 0 \text {. Find } \frac { f ( x + h ) - f ( x ) } { h }$$
- $$f ( x ) = 9 x + 6$$

A) 6
B) 9
C) $- 6 + 2 h$
D) $- 9$