Respuesta :

gmany
[tex]\dfrac{x^2+4x-5}{1-x}=\dfrac{x^2+5x-x-5}{-(x-1)}=\dfrac{x(x+5)-1(x+5)}{-(x-1)}\\\\=\dfrac{(x+5)(x-1)}{-(x-1)}=-(x+5)\\\\\boxed{Answer:-x-5}[/tex]