Question

if f(x) = 3^x + 10x and g(x) = 2x - 4 ding (f+g) (x)

Answer 1

$f(x)=3^x+10x;\ g(x)=2x-4\\\\(f+g)(x)=f(x)+g(x)=(3^x+10x)+(2x-4)=3^x+10x+2x-4\\\\\text{combine like terms}\\\\=3^x+(10x+2x)-4=\boxed{3^x+12x-4}$