For the Given Functions F and G, Find the Composition $f ( x ) = 6 x ^ { 2 } + 4 x ; g ( x ) = 3 x \quad$

Multiple Choice

For the given functions f and g, find the composition.
- $f ( x ) = 6 x ^ { 2 } + 4 x ; g ( x ) = 3 x \quad$ Find $( f \circ g ) ( x )$ .

A) $18 x ^ { 3 } + 12 x ^ { 2 }$
B) $54 x ^ { 2 } + 12 x$
C) $6 x ^ { 2 } + 7$
D) $18 x ^ { 2 } + 12 x$