Concept explainers
Explain why we exclude the values when simplifying the rational expression.
Explanation of Solution
Rational expression is in the form
The denominator in a rational expression cannot be zero because division by zero is undefined. So we need to figure out what values of the variable(s) in the expression would make the denominator equal zero. These values cannot be included in the domain, so they're called excluded values.
Excluded values are also called points of discontinuity. These are the values that make the denominator equal to zero and are not part of the domain.
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