Perform the Requested Operation on the Given Function $$f ( x ) = \sqrt { 2 x } , g ( x ) = - 5 x + 8$$

Multiple Choice

Perform the requested operation on the given function.
- $$f ( x ) = \sqrt { 2 x } , g ( x ) = - 5 x + 8$$
Find $( f g ) ( x )$ .

A) $- 5 x \sqrt { 2 x } + 8 \sqrt { 2 x }$
B) $- 10 x ^ { 2 } + 16$
C) $- 10 x + 8 \sqrt { 2 x }$
D) $\sqrt { 2 \mathrm { x } } + 40 \mathrm { x }$