For the Pair of Functions, Find the Indicated Sum, Difference $$f ( x ) = x ^ { 2 } + 1 , g ( x ) = 2 x + 5$$

Multiple Choice

For the pair of functions, find the indicated sum, difference, product, or quotient.
- $$f ( x ) = x ^ { 2 } + 1 , g ( x ) = 2 x + 5$$
Find $( f g ) ( x )$ .

A) $2 x ^ { 2 } + 2 x + 5$
B) $2 x ^ { 3 } + 5 x ^ { 2 } + 2 x + 5$
C) $2 x ^ { 3 } + 2 x ^ { 2 } + 5 x + 5$
D) $2 x ^ { 3 } + 5$