# What are Excluded Values for Rational Expressions?

Each of those values causes the denominator to equal zero.

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Excluded values for rational expressions are the values of the variable that make the denominator equal to zero. These values must be excluded from the domain of the rational expression to avoid division by zero, which is undefined. To find the excluded values, set the denominator equal to zero and solve for the variable.

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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