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 expression x h 1 + x − L h 2 1 + x ( L − x ) h 1 h 2 occurs in optics. Consider the numerator of the expression x h 1 + x − L h 2 . To make the denominators of the fractions equivalent, find the LCD of the denominators. The factor of h 1 is h 1 and the factor of h 2 is h 2 . Therefore, h 1 and h 2 are the factors of the LCD. Thus, the LCD of the denominators of each fractions is the product of h 1 and h 2 that is h 1 h 2 . To make the resulting denominator in each fraction equal to the LCD, multiply and divide the fraction by the proper quantity. x h 1 + x − L h 2 = x h 1 ⋅ 1 + x − L h 2 ⋅ 1 = x h 1 ⋅ h 2 h 2 + x − L h 2 ⋅ h 1 h 1 = x h 2 h 1 h 2 + h 1 ( x − L ) h 1 h 2 Since the denominators of the fractions are same, subtract the numerators and keep the denominator as it is. x h 1 + x − L h 2 = x h 2 + h 1 ( x − L ) h 1 h 2 = h 2 x + h 1 x − h 1 L h 1 h 2 Consider the denominator of the given expression 1 + x ( L − x ) h 1 h 2 . To make the denominators of the fractions equivalent, find the LCD of the denominators. The factor of 1 is 1 and the factors of h 1 h 2 are h 1 and h 2 . Therefore, h 1 and h 2 are the factors of the LCD. Thus, the LCD of the denominators of each fractions is the product of h 1 and h 2 that is h 1 h 2 . To make the resulting denominator in each fraction equal to the LCD, multiply and divide the fraction by the proper quantity. 1 + x ( L − x ) h 1 h 2 = 1 ⋅ 1 + x ( L − x ) h 1 h 2 = 1 ⋅ h 1 h 2 h 1 h 2 + x ( L − x ) h 1 h 2 = h 1 h 2 h 1 h 2 + L x − x 2 h 1 h 2 Since the denominators of the fractions are same, add the numerators and keep the denominator as it is

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Chapter 6.6, Problem 70E

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To perform: The indicated operations in the expression xh1+x−Lh21+x(L−x)h1h2 and simplify it.

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Chapter 6.6, Problem 69E

Chapter 6.6, Problem 71E

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Chapter 6 Solutions

EBK BASIC TECHNICAL MATHEMATICS

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 perform: The indicated operations in the expression x h 1 + x − L h 2 1 + x ( L − x ) h 1 h 2 and simplify it.

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To perform: The indicated operations in the expression xh1+x−Lh21+x(L−x)h1h2 and simplify it.

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Chapter 6 Solutions