Find the Values that make the Rational Expression Undefinedr

This video covers 4 examples on how to determine the value that makes the rational expression undefined, and then how to find the domain.
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[@karinacaro4073]

What about when you subtract or add to get the middle number and it doesn't add up (when factoring) for the last problem

[@professorkat]

If it’s not factorable, you may have to use the quadratic formula. If you email me, I may be able to help you further