Tolong bantu saya ya Kakak kakak semua..dan Tolong jangan asal asalan ya kak..

Penjelasan dengan langkah-langkah:

y = ax^2 + bx + c

(1 ,15) 15 = a + b + c

(-1, 1) 1 = a – b + c

(-2, 12) 12 = 4a – 2b + c

c = c

a + b – 15 = a – b – 1

b + b = 15 -1

2b = 14

b = 7

15 = a + 7 + c

a + c = 8

1 = a – 7 + c

a + c = 8

12 = 4a – 14 + c

4a + c = 26

c = c

8 – a = 26 – 4a

4a – a = 26 – 8

3a = 18

a = 6

c = 8 – a = 8 – 6 = 2

y = 6x^2 + 7x + 2