I need help with this section that I'm on rational expressions here's one of the problems 18/-11x and it says to list all numbers for which each rational expression is undefined

Question

phi · Answer

You do not want to ever divide by 0.     Will any x make the denominator = 0?  If so, the expression will be undefined for that x value

anonymous · Answer

I dont exactly get it I need help solving it or someone to show me

phi · Answer

Look at
$$\frac{18}{-11x} $$

the bottom means -11 times x
the whole thing means 18 divided by -11x

if 18 is divided by 0 you can not get an answer.  It is undefined.
Is there anyway for the bottom -11x to be zero?

-11 times some number x  = zero?  Is there any number when you multiply it times -11 gives you zero?  If so, that is the x value you cannot use.

anonymous · Answer

ok thxz I got it now.....Im not very good at factoring you think you can just help me with one problem from each set in this section just so i can get an understanding please

phi · Answer

make your question a new post, please.

anonymous · Answer

k