-2 color(white)(aa)|color(white)(aaa)1color(white)(aaa)0color(white)(aaa)0color(white)(aaa)0color(white)(aa)-16
color(white)(aaaaaaaaa)darr-2color(white)(aaa)4-8color(white)(aaaaa)16
color(white)(aaaa)----------
color(white)(aaaaaaaaa)1color(white)(a)-2color(white)(aaa)4-8color(white)(aaaaaa)0
color(blue)(x^3 -2x^2 + 4x -8)
x^2 (x-2) + 4 (x-2)
(x^2 + 4) (x-2)