Find the Composition $f ( x ) = 7 x ^ { 2 } + 4 x$

Multiple Choice

Find the composition.
-If $f ( x ) = 7 x ^ { 2 } + 4 x$ and $g ( x ) = 2 x$ , find $( f \circ g ) ( x )$

A) $7 x ^ { 2 } + 6$
B) $28 x ^ { 2 } + 8 x$
C) $14 x ^ { 3 } + 8 x ^ { 2 }$
D) $14 x ^ { 2 } + 8 x$