x4 − 16
x3 + x2
9 + 6x + x2
2x4 + 4x2
x5 + 20x3 + 100x
9x4 − 4x2
x2 − 4
2x2 (x2 + 2)
x · (x4 + 20x2 + 100)
(X + 2) · (X − 2)
x2 (x + 1)
( 3 + X )2
x2 · (9x2 − 4)
(x2 + 4) · (x2 − 4)
