I had the solution here, but i realize that you dont want answers.

Hint: A fraction is zero if the numerator is zero (given its denominator is not zero at the same time), a fraction is undefined if the denominator is zero.

not really, but kind of. "undefined" means we can't assign a particular value to the expression, while "does not exist" means it's not there at all

Does the term "undefined" mean the same as "does not exist"?