Question

Como se resolve a equação x!(x+2)!/(x-1)! (x+1)! ?

Answer 1

$\frac{x!(x+2)!}{(x-1)!(x+1)!}=\frac{x*(x-1)!*(x+2)*(x+1)!}{(x-1)!(x+1)!}$

Cortando (x - 1)! com (x - 1)! e (x + 1)! com (x + 1)!

$\frac{x!(x+2)!}{(x-1)!(x+1)!}=x*(x+2)\\\\\frac{x!(x+2)!}{(x-1)!(x+1)!}=x^{2}+2x$