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x^2 + 5x + 4 = 0
(x + 1)(x + 4) = 0 semua ruas dibagi 4
(4x + 1)(x + 1) = 0
x =-¼ v x= -1
karena x1 < x2, maka x1 = -¼ dan x2 = -1
jadi, 8x1 - 2x2 = 8(-¼)-2(-1) =-2+2=0