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g(f(x)) = x^2 + 3x + 4
g(x+1) = x^2 + 3x + 4
misalkan x+1 = t
maka x = t-1
g(x+1) = x^2 + 3x + 4
g(t) = (t-1)^2 + 3(t-1) + 4
g(t) = t^2 -2t + 1 + 3t - 3 + 4
g(t) = t^2 + t + 2
yang ditanyakan adalah g(x).. maka substitusikan t menjadi x
g(t) = t^2 + t + 2
g(x) = x^2 + x + 2