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kalau f(x) diketahui, tinggal ganti aja x = x-2 -_-
f(x) = x² - x + 3
f(x - 2) = (x - 2)² - (x - 2) + 3
f(x - 2) = x² - 4x + 4 - x + 2 + 3
f(x - 2) = x² - 4x - x + 4 + 2 + 3
f(x - 2) = x² - 5x + 9
udah, selesai :D