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0 = 2x + 2
-2 = 2x
x = -1 ( balik minimum )
f (-1) = (-1)² + 2. -1 + 4
f (-1) = 1 -2 + 4
f (-1) = 3
jadi nilai balik minimum fungsi f(x) = x² + 2x + 4 = (-1,3)
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