persamaan parabola ... yg pintar matematika tentang para bola bantu saya

Persamaan parabola melalui (x1,0)
= (-4,0) dan (x2,0) = (2,0)
f(x) = 0
a(x - x1)(x - x2) = 0
a(x + 4)(x - 2) = 0

Melalui (0,8)
f(0) = 8
a(x + 4)(x - 2) = 8
a(0 + 4)(0 - 2) = 8
-8a = 8
a = -1

Persamaan parabola :
f(x) = a(x - x1)(x - x2)
f(x) = -(x + 4)(x - 2)
f(x) = -x² - 2x + 8 ✔