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a) f(x) = 2x² - 1
f(0) = 2(0)² - 1 = 0 - 1 = -1
f(1) = 2(1)² - 1 = 2 - 1 = 1
f(2) = 2(2)² - 1 = 2(4) - 1 = 7
f(3) = 2(3)² - 1 = 2(9) - 1 = 17