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f(x) = x² - x + 1 dan (gof)(x) = x⁴ - 4x³ - 3x² + 4x + 5.
Pemisalan:
x² - x + 1 = a
x² - x = a - 1
Dari definisi (fog)(x)
(gof)(x) = x⁴ - 4x³ - 3x² + 4x + 5
g (f(x)) = x⁴ - 4x³ - 3x² + 4x + 5
g (x² - x + 1) = (x² - x + 1)⁴ - 4(x² - x + 1)³ - 3(x² - x + 1)² + 4(x² - x + 1) + 5
Masukkan pemisalan tadi;
g (x² - x + 1) = (x² - x + 1)⁴ - 4(x² - x + 1)³ - 3(x² - x + 1)² + 4(x² - x + 1) + 5
g (a) = (a - 1 + 1)⁴ - 4(a - 1 + 1)³ - 3(a - 1 + 1)² + 4(a - 1 + 1) + 5
g (a) = a⁴ - 4a³ - 3a² + 4a + 5
Rubah a menjadi x;
g (x) = x⁴ - 4x³ - 3x² + 4x + 5