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α=2β
α+β= -b/a = -m/2
αβ= c/a = 8
αβ= 8
2β.β= 8
2β²= 8
β²= 4
β= 2
β=2 , α=2
α+β= -m/2
4= -m/2
m= -8
Jadi, jawban ny -8