1) a⁹-b³=(a³)³-b³ = (a³-b)ₓ((a³)²+a³b+b²) = (a³-b)ₓ(a⁶+a³b+b²)
2) a⁶-b⁶ = (a³)²- (b³)²= (a³-b³)ₓ(a³+b³) = (a-b)ₓ(a²+ab+b²)ₓ(a+b)ₓ(a²-ab+b²)
3) x⁶-729 = x⁶- 3⁶ = (x³)²-(3³)²=(x³-3³)ₓ(x³+3³) = (x-3)ₓ(x²+3x+9)ₓ(x+3)ₓ(x²-3x+9)
4) 64 - y⁶= 2⁶-y⁶= (2³-y³)ₓ(2³+y³) = (2-y)ₓ(4+2y+y²)ₓ(2+y)ₓ(4-2y+y²)