0 -18 0 81
 (x-3)(x-3)(x+3)(x+3)
 5 10 15 21
 (x2+3)(x2+5x+7)
 0 6 0 9
 (x2+3)(x2+3)
 0 -6 0 9
 (x2-3)(x2-3)
 0 10 0 9
 (x2+1)(x2+9)
 1 3 2 2
 (x2+x+1)(x2+2)
 8 22 46 55
 (x+5)(x3+3x2+7x+11)
 -2 -8 -24 -55
 (x-5)(x3+3x2+7x+11)
 2 -13 -14 24
 (x-1)(x+2)(x-3)(x+4)
 1 0 1 0 // helps with WA 6
 (x)(x3+x2+1)
 1 0 -1 0
 (x)(x3+x2-1)
 1 0 -2 0
 (x)(x-1)(x2+2x+2)

May be there are good tests but they didn't help me with WA13.

For 0 -18 0 81 (first test) (x-3)(x+3)(x-3)(x+3) the correct answer?

Edited by author 22.01.2010 21:03

Test:

0 0 0 4

answer:
(x2+2x+2)(x2-2x+2)