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x1 = 6 dan x2 = -5
HP : {6,-5}
= x² + 6x - 5x - 30
= x(x + 6) - 5(x + 6)
= (x + 6)(x - 5) = 0
x = -6 dan x = 5
x = {-6 dan 5} ---------------> tinggal pilih salah satu