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x^2 – 4x + 4 < 9
x^2 – 4x + 4 – 9 < 0
x^2 – 4x – 5 = 0
(x–5)(x + 1) = 0
x = 5 atau x = -1
setelah diuji mennggunakan garis bilangan didapatkan
Hp = {-1<x<5}
maaf klo salah