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x = -b/2a = 3 atau b = -6a
f(x) = ax² - 6ax + c
f(3) = 9a - 18a + c = -2
-9a + c = -2 ...... (i)
f(0) = c = 16
maka a = 2
f(x) = 2x² - 12x + 16