Pre-Calculus 11 Notes

By: Gen L.

Lesson 3: Multiplying & Dividing Rationals

Review:

• How did you multiply fractions?
• Remember simplifying first?
• Or kiss & flip?
• The processes hold true for rational expressions.

Example 1: Simple Multiplication

1. • State NPVs: , and factor.
2. • Cross-cancel.
3. • Multiply & factor.
4. • Simplify

Example 2: Challenging Multiplication

1. • Factor.
2. • State NPVs:
3. • Cross-Cancel & Simplify

How to Divide:

• Use Kiss & Flip, proceed as above.
• State all NPVs that apply at any point.
• There are multiple stages in the simplification.
• Let's see using an example, shall we?

Example 3: Division

1. • Factor.
2. • State NPVs: , Kiss & Flip.
3. • ADD NPVs: , Cross-cancel

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