# Adding and Subtracting Rational Expressions - PowerPoint PPT Presentation

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## Adding and Subtracting Rational Expressions

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### Adding and Subtracting Rational Expressions Lesson 3.10 Page 171 – PowerPoint PPT presentation

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Title: Adding and Subtracting Rational Expressions

1
• Lesson 3.10
• Page 171

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3
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Example 3 (Subtracting-Like)
5
Example 4 (Subtracting-Like)
6
What happens if the denominators are not the same?
• You must make them the same by finding a least
common denominator!

7
Definition LCD Least Common Denominator
• The least common denominator (LCD) of two
• or more rational expressions is the product of
• the factors of the rational expressions with each
• common factor used only once.

10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110,
120, 130, 140
14, 28, 42, 56, 70, 84, 98, 112, 126, 140
8
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Adding or Subtracting Rational Expressions with
Different Denominators
• Find the least common denominator (LCD).
• Rewrite each rational expression as an equivalent
fraction with the least common denominator as the
denominator.
• Add or subtract the numerators to get the
numerator sum or difference. The least common
denominator is the denominator.
• Write the answer in lowest terms.

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Example 7 (Subtracting-Unlike)
First factor the denominators.
12
Rewrite each rational expression as an equivalent
fraction with the least common denominator as the
denominator.
13
Subtract the numerators. The least common
denominator is the denominator.
14
Finally write the answer in lowest terms.
15
HW 198 1-13 odd, 17-29 odd
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HW 198 1-13 odd, 17-29 odd