Misal
x + 1 = m
x = m - 1
f(x + 1) = 3x² - 2x - 5
f(m) = 3(m - 1)² - 2(m - 1) - 5
f(m) = 3(m² - 2m + 1) - 2m + 2 - 5
f(m) = 3m² - 6m + 3 - 2m - 3
f(m) = 3m² - 8m
f(x) = 3x² - 8x
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Misal
x + 1 = m
x = m - 1
f(x + 1) = 3x² - 2x - 5
f(m) = 3(m - 1)² - 2(m - 1) - 5
f(m) = 3(m² - 2m + 1) - 2m + 2 - 5
f(m) = 3m² - 6m + 3 - 2m - 3
f(m) = 3m² - 8m
f(x) = 3x² - 8x