tolong plis!!.......................

f(x) = 2x + 4 dan ( f o g )(x) = 4x^2 + 2x
f o g (x) = 4x^2 + 2x
f { g (x) } = 4x^2 +2x
2.g(x) + 4 = 4x^2 +2x
2g(x) = 4x^2 +2x -4
g(x) = (4x^2 +2x -4)/2
g(x) = 2x^2 + x -2