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Lesson 3.2 Multiplying & Dividing Rational
Expressions Page 153
Multiplying Fractions Review!
• When multiplying fractions, always reduce first! Then multiply across.
Example:
Simplify first, then multiply across (answers can be left in factored form). Don’t forget to state excluded values , when asked. (what x-value makes the denominator = 0)
Page 153
Not in book
Page 153
Steps for Multiplying Rational Expressions: 1.Factor if possible. (This is a good time to find excluded values if asked) 2.Divide out common factors (reduce) 3.Multiply across top and bottom (may leave as factors)
Page 154
Not in book
Page 154
Not in book
Page 155
Page 156
Page 156
Page 156
Not in book
Page 157
Page 157
Not in book
Page 157
Landing our Big Ideas:
Remember the basics: • Always start factoring by looking for a GCF • Reduce early • Divide means flip second fraction and multiply • Make all polynomials fractions by putting a 1 below them • Multiply across top and bottom • Cancel entire factors when reducing
Excluded Values: Denominator can’t be zero. • Factor and find excluded values before combining or reducing
Assignment 3.2 (page 154-161)
#’s 1 – 11, 18, 21, 23, 27, 33, 36 Additional 3.2 Problems: #1-3
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