G = .....????? Jika f : akar(x-1) h : 2x^2 dan f o g o h = 2 akar(2x^2 - 1)

(f o g o h)(x) = 2√(2x² - 1)
f(g(2x²)) = 2√(2x² - 1)
√(g(2x²)-1) = 2√(2x² - 1)
g(2x²)-1 = 4(2x² - 1)
g(2x²) = 8x²-4+1
g(2x²) = 8x²-3
misal y = 2x²
g(y) = 4y-3
g(x) = 4x-3