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2² . - 18 . + 8 < 0
4 . - 18 . + 8 < 0
2 . - 9 . + 4 < 0
(2 . - 1) ( - 4) < 0
dengan asumsi :2. - 1 = 0 atau - 4 = 0
2 . = 1 atau = 4
= atau x = 2
x = - 1
-------------I--------------I-----------
-1 2
Hp = { x/ - 1 < x < 2 ; x ∈ R }