Question

find f(g(x)) and g(f(x) when f(x)=4+5x and g(x)=2x-1

Answer 1

for f(g(x)) plug in g(x) wherever you see an "x" in the f(x) function. So, it's 4_5(g(x))

you already know your g(x), it is 2x-1!

Now, same thing for g(f(x)). Except you are plugging in f(x) instead of g(x) for every "x" in your function g(x). 2[f(x)]-1