Ayuda( 6mna * 3 - 5m4y5n8) * 2?

Hola Sevastian, seria asi :

<img src="https://tex.z-dn.net/?f=%20%28%206mna%5E%7B3%7D-800myn%29%5E%7B2%7D%20" />

Seria seria el producto notable :

<img src="https://tex.z-dn.net/?f=%28a%20-%20b%29%5E%7B2%7D%20%3Da%5E%7B2%7D%20-2ab%2Bb%5E%7B2%7D%20" />

Entonces :

<img src="https://tex.z-dn.net/?f=%5B%286mna%5E%7B3%7D%29%5E%7B2%7D%20-%202%2A%286mna%5E%7B3%7D%29%2A%28800myn%29%20%2B%20%28800myn%29%5E%7B2%7D%20" />

<img src="https://tex.z-dn.net/?f=%5B%2836m%5E%7B2%7Dn%5E%7B2%7D%20a%5E%7B6%7D%29%20-%20%2812mna%5E%7B3%7D%29%2A%28800myn%29%20%2B%20%28640000m%5E%7B2%7Dy%5E%7B2%7Dn%5E%7B2%7D%20%29" />

<img src="https://tex.z-dn.net/?f=36a%5E%7B6%7Dm%5E%7B2%7Dn%5E%7B2%7D%20%20-%209600a%5E%7B3%7Dm%5E%7B2%7D%20n%5E%7B2%7Dy%20%2B%20640000m%5E%7B2%7Dy%5E%7B2%7Dn%5E%7B2%7D%20" />

Espero haberte ayudado!

Saludos!