# When is a Rational Expression Undefined or Zero?

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When is a rational expression undefined?
A fraction with a denominator of zero is undefined.
Similarly, a rational expression with a denominator of zero is undefined.
To find the values that make a rational expression undefined, we set the denominator equal to zero and solve the resulting equation.

When is a rational expression zero?
A rational expression is zero when the numerator is zero.
To find the values that make a rational expression zero, we set the numerator equal to zero and solve the resulting equation.

Rational Expressions - When is it undefined?

For what values of x is the rational expression undefined?

Rational Expression- When is it zero?

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