Find the Composition $f ( x ) = 6 x ^ { 2 } - 5 x$

Multiple Choice

Find the composition.
-If $f ( x ) = 6 x ^ { 2 } - 5 x$ and $g ( x ) = - 3 x$ , find $( g \circ f ) ( x )$

A) $- 18 x ^ { 3 } + 15 x ^ { 2 }$
B) $- 18 x ^ { 2 } + 15 x$
C) $6 x ^ { 2 } - 10$
D) $54 x ^ { 2 } - 5 x$