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x=6/2(1) = -6/2 = -3
y=6^2 - 4(1)(8)/-4(1) = 36 - 32 / -4 = 4/-4 = -1
puncak (-3,-1)
titik potong =
y = x^2+6x+8
(x+2)(x+4)
x = -2 atau x=-4