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Verified answer
Bab Fungsi KuadratMatematika SMP Kelas VIII
(xp, yp) = (4, 8)
(x, y) = (6, 12)
y - yp = a (x - xp)²
12 - 8 = a . (6 - 4)²
4 = a . 2²
a = 4/4
a = 1
y = a (x - xp)² + yp
= 1 . (x - 4)² + 8
= x² - 8x + 16 + 8
= x² - 8x + 24