Why​ can't the denominators of rational expressions be​ zero How can we find the domain of a rational​ function?

Why​ can't the denominators of rational expressions be​ zero How can we find the domain of a rational​ function?
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Answer :

Rational expressions are fractions and are therefore undefined if the denominator is​ zero;  the domain of a rational function is all real numbers except those that make the denominator of the related rational expression equal to 0. If a denominator contains​ variables, set it equal to zero and solve.
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