8.1.3 Adding and Subtracting Rational Expressions Key Objectives • Find the least common multiple of polynomials. • Add and subtract rational expressions. • Simplify complex fractions. Key Terms • A complex fraction is a fraction that contains one or more fractions in the numerator, the denominator, or both. Example 1 Adding and Subtracting Rational Expressions with Like Denominators Adding and subtracting rational expressions is similar to adding and subtracting fractions. To add or subtract rational expressions with like denominators, add or subtract the numerators and use the same denominator.
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