Ответ:

Объяснение:

1)

x^2-8x+12

D = 64 - 48 = 16

x1 = 8+4/2 = 6

x2 = 8-4/2 = 2

x^2-8x+12 = (x-6)(x-2)

2)

3x²-x-4

D = 1 + 3*4*4 = 1 + 48 = 49

x1 = 1 + 7/6 = 8/6 =

x2 = 1 -7/6 = -1

3x²-x-4 = 3(x+1)(x-(8/6))