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Verified answer
G(x) = 2/(x + 1)Misal : f(x) = a
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g(f(x)) = g(a) = x² + 3x - 18
2/(a + 1) = x² + 3x - 18
a + 1 = 2/(x² + 3x - 18)
a = 2/(x² + 3x - 18) - 1
samakan penyebutnya
a = (2 - (x² + 3x - 18))/(x² + 3x - 18)
a = (-x² - 3x + 20)/(x² + 3x - 18)
f(x) = (-x² - 3x + 20)/(x² + 3x - 18) ✔