Answer :

foil
3a6+ 4a6+ 6a4+8a6
15a6+6a4
(a³-2a²)-(3a²-4a³)
=a³-(-4a³)-2a²-3a²
=a³+4a³-5a²
=5a³-5a²
=5 (a³-a²)

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