Find the Value for the Function $f ( 2 x ) \text { when } f ( x ) = \sqrt { 5 x ^ { 2 } + 9 x }$

Multiple Choice

Find the value for the function.
-Find f( $f ( 2 x ) \text { when } f ( x ) = \sqrt { 5 x ^ { 2 } + 9 x }$

A) $2 \sqrt { 5 x ^ { 2 } + 9 x }$
B) $\sqrt { 10 x ^ { 2 } + 18 x }$
C) $\sqrt { 20 x ^ { 2 } + 18 x }$
D) $\sqrt { 10 x ^ { 2 } + 36 x }$