Question

Find the nonpermissible replacement for the variable in this expression. 3x/5x+2

Answer 1

People seem to be coming up with some strange terminology these days.
nonpermissable means "not allowed"

we do not want to divide by 0, so I think they want the x value that is "not allowed"
in other words, the x value that makes the bottom equal to zero.

Answer 2

set the denominatot = 0. that the number that cannot be used.