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a = p
b = p+2
c = 4 - p
memotong sumbu x didua titik --> D > 0 dan p≠ 0
D = b² - 4ac
b² - 4ac > 0
(p+2)² - 4(p)(4-p) > 0
p² + 4p + 4 - 16p + 4p² > 0
5p² - 12p + 4 > 0
(5p -2)(p -2) > 0
p < 2/5 atau p > 2