grafik fungsi kuadrat memotong sumbu x di titik (p-2 , p) dan (q+6 , q). grafik fungsi kuadrat tersebut melalui tirik (1, -30). rumus fungsi f adalah..

memotong sumbu x maka y = 0
y = p = 0
x = p - 2 = -2
(x1,y1) = (-2,0)
y = q = 0
x = q + 6 = 6
(x2,y2) = (6,0)
titik (x,y) = (1,-30)

y = a(x - x1)(x - 2)
-30 = a(1 - (-2))(1 - 6)
-30 = a(3)(-5)
-30 = -15a
a = 2
y = 2(x + 2)(x - 6)
y = 2(x² - 4x - 12)
y = 2x² - 8x - 24