= (х²-9) (х²+9)-6х (х²-9) = (х-3) (х+3) (х²+9)-6х (х-3) (х+3) = (х-3) (х+3) (х²+9-6х) = (х-3) (х+3) (х-3)² = (х-3)³ * (х+3)
= (х²-9) (х²+9)-6х (х²-9) = (х-3) (х+3) (х²+9)-6х (х-3) (х+3) = (х-3) (х+3) (х²+9-6х) = (х-3) (х+3) (х-3)² = (х-3)³ * (х+3)