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domain x= (-2, -1, 0 , 1, 2)
f(-2) = (-2)² - 2 = 2
f(-1) = 1 - 1 = 0
f(0) = 0+0 = 0
f(1) = 1+1 = 2
f(2) = 4 + 2 = 6
daerah hasil 0≤ y ≤ 6