For the Given Pair of Functions, Find the Requested Function $f(x)=5 x-3, g(x)=-9 x^{2}-15 x+6 ;(f+g)(x)$

Multiple Choice

For the given pair of functions, find the requested function.
- $f(x) =5 x-3, g(x) =-9 x^{2}-15 x+6 ;(f+g) (x)$

A) $-9 x^{2}+10 x+3$
B) $-9 x^{2}-10 x+3$
C) $9 x^{2}-4 x-9$
D) $-10 x^{2}-10 x-3$