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## § 6.3

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**Addition and Subtraction of Rational Expressions with a**Common Denominator § 6.3**5**5 2 2 Add . + + 12 12 12 12 7 = 12 Adding/Subtracting Fractions**Subtract**Common Denominators • Add or subtract the numerators. • Place the sum or difference of the numerators found in step 1 over the common denominator. • Simplify the fraction if possible.**a.) Add**Common Denominators Example:**b.) Subtract**Common Denominators Example:**Least Common Denominator**• Factor each denominator completely. Any factors used more than once should be expressed as powers. • List all different factors that appear in any of the denominators. When the same factor appears in more than one denominator, write that factor with the highest power that appears. • The least common denominator (LCD) is the product of all the factors listed in step 2.**a.)**b.) c.) Least Common Denominator Find the LCD: The LCD is (2x + 5)(x – 5). The LCD is x(x + 1). The LCD is 36w5z4.