Find the Function Value $f ( 2 a )$ When $f ( x ) = 8 x ^ { 2 } + 7 x$

Multiple Choice

Find the function value.
-Find $f ( 2 a )$ when $f ( x ) = 8 x ^ { 2 } + 7 x$ .

A) $8 a ^ { 2 } + 14 a$
B) $32 a ^ { 2 } + 7 a$
C) $16 a ^ { 2 } + 14 a$
D) $32 a ^ { 2 } + 14 a$