Respuesta :

FLORC
if 1-x/x+1 is undefined then the bottom number must be 0
set
x+1=0
x=-1
YukkiD
hm 1-x=0 and x+1=0 so we need to make them bothe equal zero so we just flip both ones and we should get when 1-x=0, x=1 and when x+1=0, x=-1