Beispiel:

x4 - 10x2 + 9 = 0

Substituiere: z = x2
z2 - 10z + 9 = 0 z 1,25 ± 4
Rücksubstitution: x2 = z
x2 = z 1 = 9 x1,2 = ±3
x2 = z 2 = 1 x3,4 = ±1
L = {-3,-1, 1, 3} .
.