Bantuin dong, soal tentang fungsi kuadrat nih..

jawaban b . smg membantu yaa kamera gw lg eror

x1 = 1, x2 = 4, (x, y) = (0,-12)
y = a(x - x1)(x - x2)
-12 = a(0 - 1)(0 - 4)
-12 = 4a
a = -3
Persamaan fungsi kuadrat
y = a(x - x1)(x - x2)
y = -3(x - 1)(x - 4)
y = -3(x^2 - 5x + 4)
y = -3x^2 + 15x - 12