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y' = 4x + 8
4x + 8 = 0
4x = -8
x = -8/4
x = -2
y = 2(-2)^2 + 8(-2) + 3
= 2.4 - 16 + 3
= 8 - 16 + 3
= -5
Jadi, titik puncaknya adalah (-2, -5)