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Verified answer
Bab Persamaan KuadratMatematika SMP Kelas VIII
f(x) = x² - 6x + 5
a = 1; b = -6; c = 5
a] sumbu simetri = x = -b/2a
= -(-6)/(2 . 1)
= 3
b] f(3) = 3² - 6 . 3 + 5
= 9 - 18 + 5
= -4
koordinat titik balik = (3, -4)