Hola! :3
Sabemos que un binomio al cubo es igual a:
(x±y)³=x³±3x²y+3xy²±y³
Reemplazamos:
(a-4)³=a³-3(a²)(4)+3(a)(4²)-(4)³
(a-4)³=a³-12a²+3(a)(16)-64
(a-4)³=a³-12a²+48a-64
Espero haberte ayudado :D
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Verified answer
Hola! :3
Sabemos que un binomio al cubo es igual a:
(x±y)³=x³±3x²y+3xy²±y³
Reemplazamos:
(a-4)³=a³-3(a²)(4)+3(a)(4²)-(4)³
(a-4)³=a³-12a²+3(a)(16)-64
(a-4)³=a³-12a²+48a-64
Espero haberte ayudado :D