n²+2n+1
Explicação passo a passo:
(n+2)*(n+1)*n*(n-1)!+(n+1)*(n-1)!/(n+1)*(n-1)!
(n²+2n)*(x+1)+n+1/n+1
n³+n²+2n²+2n+n+1/n+1
n³+3n²+3n+1/n+1
(n+1)³/n+1
(n+1)²
