Question

dividing rational expressions quiz
algebra 2 a ae teacher (ace ed) / module 6: rational functions and relations

1. why do you need to state restrictions on the variable when dividing rational expressions?

to make sure that the rational expression does not equal zero.
to exclude values that will make the numerator of a rational expression equal 0.
to make sure that the rational expression always equals zero.
to exclude values that will make the denominator of a rational expression equal 0.

Explanation:

Rational expressions are undefined when their denominators are zero. Restrictions on variables exclude these values to ensure the expression is valid.

Answer:

To exclude values that will make the denominator of a rational expression equal 0.