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y' = 4x - 8
y' = 0
4x - 8 = 0
4x = 8
x = 8/4
x = 2
y = 2(2)² - 8(2) + 17
= 2(4) - 16 + 17
= 8 - 16 + 17
= 9
koordinat titik balik = (2, 9)