Tolong gan nomor 9 satu nomor lagi

Kelas 10 Matematika
Bab Fungsi Kuadrat

Puncak (3, 8)
Melalui titik (5,0)

y - yp = a . (x - xp)²
0 - 8 = a . (5 - 3)²
-8 = a . 4
a = -8/4
a = -2

y = a . (x - xp)² + yp
y = (-2) . (x - 3)² + 8
y = (-2) . (x² - 6x + 9) + 8
y = -2x² + 12x - 18 + 8
y = -2x² + 12x - 10

Jawabannya B