(f- g) (x) = 3^x + 10x - (5x - 3)
(f- g) (x) = 3^x + 10x - 5x + 3
(f- g) (x) = 3^x + 5x + 3
Answer
B. 3^x + 5x + 3
[tex]f(x)=3^x+10x;\ g(x)=5x-3\\\\(f-g)(x)=f(x)-g(x)=(3^x+10x)-(5x-3)\\\\=3^x+10x-5x+3=\boxed{3^x+5x+3}\to\boxed{B.}[/tex]
