Question

If f(x)=3^x+10× and g(x)=2x-4, find (f-g)(x)

Answer 1

The problem is asking for the difference between the formulas for the functions f and g (in that order). So you subtract g from f.

$(f-g)(x)=f(x)-g(x) =(3^x + 10x) - (2x - 4) \\ = 3^x+10x-2x+4$