kak ini bagaimana ?? tolong bagi yang tauu

y = x² + bx + c

Titik puncak (1 , 6)

1 = -b/2a
1 = -b/2(1)
b = -2

y = x² - 2x + c

D = b² - 4ac
D = (-2)² - 4(1)c
D = 4 - 4c

6 = -D/4a
6 = (4 - 4c) / -4
-24 = 4 - 4c
4c = 28
c = 7