Explanation Procedure used: Addition or Subtraction of Rational Numbers (Fraction) with unlike denominators: 1. Compute the LCD of the denominators. 2. Write fraction with the LCD as the denominator. 3. Add or subtract the numerators and write the result over the common denominator. 4. Write the result in lowest terms. “ Finding the lowest common denominator ( LCD ) : 1. Find the prime factors of each denominator. 2. For each different prime factor that appears, note the highest power to which it is raised in any one of the denominators. 3. Form the product of all the different prime factors, each raised to the power found in step 2. This product is called the lowest common denominator.” Calculation: The given fractional expressions are a + 3 a and a 2 . Note that, the denominators of the above fractions are different. To make the denominators of the fractions equivalent, find the LCD of the denominators. The factor of a is a and the prime factor of 2 is 2. Therefore, 2 and a are factors of the LCD. Thus, the LCD of the denominators of each fractions is the product of 2 and a that is 2 a . To make the resulting denominator in each fraction the LCD, multiply and divide the fraction by the proper quantity. a + 3 a − a 2 = a + 3 a ⋅ 1 − a 2 ⋅ 1 = a + 3 a

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Author: Allyn Washington, Richard Evans

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Chapter 6.6, Problem 12E

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Pearson eText for Basic Technical Mathematics with Calculus -- Instant Access (Pearson+)

Ch. 6.1 - Prob. 1PE Ch. 6.1 - Prob. 2PE Ch. 6.1 - Prob. 3PE Ch. 6.1 - Prob. 4PE Ch. 6.1 - Prob. 1E Ch. 6.1 - Prob. 2E Ch. 6.1 - Prob. 3E Ch. 6.1 - Prob. 4E Ch. 6.1 - Prob. 5E Ch. 6.1 - Prob. 6E

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To subtract: The fractional expressions a + 3 a and a 2 and simplify it.

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