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f'(x) = 0
2x - 6 = 0
2x = 6
x = 3
Masukkan nilai x ke persamaan awal, sehingga didapat nilai y yaitu :
y = (3)² -6(3) +5
y= 9-18+5 = -4
Sehingga koordinat titik balik nya adalah (3,-4)