Question

Ini gimana ya cara ngerjainnya #MTK pliss........kak​

Answer 1

Titik potong sumbu x
(-1, 0) dan (4, 0)

y = a(x - x1)(x - x2)
y = a(x - (-1))(x - 4)
y = a(x + 1)(x - 4)

melalui titik (-8, 0)
-8 = a(0 + 1)(0 - 4)
-8 = a(1)(-4)
-4a = -8
a = 2

Persamaan fungsi kuadrat
y = a(x + 1)(x - 4)
y = 2(x² - 3x - 4)
y = 2x² - 6x - 8

Jawabannya C