Mohon dijawab disertai cara kerjanya. Please!

3. f(x)=2x f(g(x))= -x/2+1 g(x)=?

2(g(x))= -x/2+1
g(x) = -x/2+1÷2
g(x) = -x+2/4
g(x)= 1/4(2-x)

4. f(x) = x-1/x+1 g(x)= x^2+1 / 1-x^2 f(g(x))=?

f(x^2+1 / 1-x^2)
(x^2+1 / 1-x^2 )-1 ÷ (x^2+1 / 1-x^2)+1

2x^2÷1-x^2÷2÷1-x^2=2x^2÷2=x^2