\[x^{2} - 8x + 12 = (x - 6)(x - 2)\]
\[D_{1} = 16 - 12 = 4\]
\[x_{1} = 4 + 2 = 6;\text{\ \ }x_{2} = 4 - 2 = 2.\]
\[Ответ:x^{2}x + 12 = (x - 6)(x - 2).\]