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4x kuadrat - 28x + 49 < 9
4xkuadrat -28x+49-9 < 0
4xkuadrat -28x +40 < 0
(2x - 4 )(2x- 10) < 0
2x-4 = 0
x= 2
atau
2x-10 = 0
x= 5 jadi, Hp= {xI2<x<5, x E R }