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f(x) = x - 2
(gof)(x) = x² - 6x + 9
g(f(x) = x² - 6x + 9
g(x - 2) = x² - 6x + 9
g(x - 2 + 2) = (x + 2)² - 6(x + 2) + 9
g(x) = x² + 4x + 4 - 6x - 12 + 9
g(x) = x² - 2x + 1