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=> (a + 3)(a^2 + 9) (a - 3) = (a^3 + 9a + 3a^2 + 27)( a - 3)
.....................................= (a^3 + 3a^2 + 9a + 27)( a - 3)
.....................................= a^4 - 3a^3 + 3a^3 - 9a^2 + 9a^2 - 27a + 27a - 81)
.....................................= a^4 - 81 => RESPUESTA.
Espero haberte colaborado. suerte