1. The problem statement, all variables and given/known data For which value(s) of x is each expression not defined? 2. Relevant equations x^2+3x-6 divided by x^2-x-12 3. The attempt at a solution The answer that was given turned out to be: x^2+3x-6 divided by (-4)(x+3) Restrictions: x ≠ 4,-3 ______________________________________________________________________________ I'm trying to learn what a restriction is and what the point of them are, but I've only come across complicated answers from all over the web. Some of the questions I've encountered apparently don't have any restrictions at all as well. If I can learn what these are then Rational Expressions will become that much easier for me, thank you.