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a+b = -b/a
= 2m
kali akar2
ab = c/a
= 8m
a²+b²+ab = (a+b)²-2ab + ab
= (a+b)²-ab
= (2m)²-8m
= 4m²-8m
minimum m saat turunan 4m²-8m adalah 0
8m-8 = 0
8m = 8
m = 1