For the Given Functions F and G, Find the Requested $f ( x ) = 5 x + 9$

For the given functions f and g, find the requested function.
-If $f ( x ) = 5 x + 9$ and $g ( x ) = 3 x - 1$ , find $( f \cdot g ) ( x )$ .

A) $( f \cdot g ) ( x ) = 8 x ^ { 2 } + 22 x + 8$
B) $( \mathrm { f } \cdot \mathrm { g } ) ( \mathrm { x } ) = 15 \mathrm { x } ^ { 2 } - 9$
C) $( f \cdot g ) ( x ) = 15 x ^ { 2 } + 26 x - 9$
D) $( f \cdot g ) ( x ) = 15 x ^ { 2 } + 22 x - 9$