(x−9)(x7+x6+x5+x4+x3+x2+x+1)
x8+x7+x6+x5+x4+x3+x2+1x−9x7−9x6−9x5−9x4−9x3−9x2−9x−9
x8−8x7−8x6−8x5−8x4−8x3−8x2−8x−9