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x+2 = 0 ----> x = -2
x+1 = 0 ----> x = -1
x² - 3x + 2 = 0 ----> x = 1 atau x = 2
__-______+__________+_______-_____+_
-2 -1 1 2
jadi HP = { -2<x<1 atau x>2 , x -1}