Question

simplificar el valor de la expresion: (n + 1)^3 + (n - 1)^3

Answer 1

Respuesta:

$\left(n\:+\:1\right)^3\:+\:\left(n\:-\:1\right)^3$

$\left(n+1\right)^3=n^3+3n^2+3n+1$

$n^3+3n^2+3n+1+\left(n-1\right)^3$

$\left(n-1\right)^3=n^3-3n^2+3n-1$

$n^3+3n^2+3n+1+n^3-3n^2+3n-1$

$2n^3+6n$

Saludos...