Question

Which item is true of f(x) and g(x)?

They are inverses if f(g(x)) = g(f(x)) = -x

They are inverses if f(g(x)) = g(f(x)) = 1

They are inverses if f(g(x)) = g(f(x)) = x

They are inverses if f(g(x)) = g(f(x)) = 0

Answer 1

I think the answer should be there in versus if f g of x is equal to G F of x = 2 x