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A rational expression needs values excluded because a variable denominator could equal:
AThe value ten
BThe value zero
CThe value one
DThe value two
Answer & Solution
Correct answer: B. The value zero
1. A variable hides what a number would show.
2. Division by 0 is undefined.
3. With a numerical fraction we can see the number in the denominator.
4. A variable denominator can take the value zero for some inputs, so those are excluded.
_Source: OpenStax Elementary Algebra 2e (CC BY 4.0), Ch 8 'Rational Expressions and Equations', sections 8.1-8.9_
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