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coba satu per satu
a.(1,-6)
(-6) < 2(1)² - 10(1)
-6 < -8 [salah]
b. (4,2)
(2) < 2(4)² - 10(4)
2 < -8 [Salah]
c. (-1,4)
(4) < 2(-1)² - 10(-1)
4 < 12 [Benar]