Resposta :

3478elc


  f(x)=3x+1 e g(x)=2x+3 

f(g(x))= 3(2X+3)+1 ==> 6X+9+1 ==> 3X + 10

g(f(x))= 2(3X+1) + 3 ==> 6X + 2 + 3 ==> 6X + 5

f(f(x))= 3(3X+1) + 1 ==> 9X + 3 + 1 ==> 9X  + 4

g(g(x))= 2(X+3) + 3==> 6X+6 + 3 ==> 6X + 9

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