alleryStart learning →Two rational expressions with denominators x and x plus 1 must first be given:
AThe same variable
BA common denominator
CA common numerator
DThe same exponent
Answer & Solution
Correct answer: B. A common denominator
1. The denominators here are unlike.
2. Adding rational expressions works like adding fractions.
3. When denominators are unlike we will need to get common denominators.
4. Here x and x plus 1 are different expressions.
5. So a common denominator must be found before adding.
_Source: OpenStax Elementary Algebra 2e (CC BY 4.0), Ch 8 'Rational Expressions and Equations', sections 8.1-8.9_
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