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misal: x+1 = a
x = a-1
f(a) = 2(a-1)² - (a-1) - 3
= 2(a² - 2a + 1) - a + 1 - 3
= 2a² - 4a + 2 - a + 1 - 3
f(a) = 2a² - 5a
f(x) = 2x² - 5x (E)
semoga membantu ya :)