Find and Simplify the Difference Quotient $$\frac { f ( x + h ) - f ( x ) } { h } , h \neq 0$$

Multiple Choice

Find and simplify the difference quotient $$\frac { f ( x + h ) - f ( x ) } { h } , h \neq 0$$ for the given function.
- $$f ( x ) = x ^ { 2 } + 8 x - 9$$

A) $2 x + h - 9$
B) $2 x + h + 8$
C) 1
D) $\frac { 2 x ^ { 2 } + 2 x + 2 x h + h ^ { 2 } + h - 18 } { h }$