Chapter 4: Solving Inequalities

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Chapter 4 Solving Inequalities

• Set Notation

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Set

• A group of things
• In algebra, this is a group of numbers that are
  related somehow

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elements

• Numbers that are included in the sets

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Set Notation

• Ø empty set
• C complex numbers (algebra 2)
• N natural numbers
• Q rational numbers (think fractions)
• R real numbers
• Z integers

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Other Notation

• Union of two sets
• Means that you take two sets and combine all of
  their elements
• Intersection of two sets
• Means that you only keep the elements that are in
  both sets of numbers

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Example 1

• C 6, 9, 12, 15, 18, 21
• D x x is a positive odd integer
• What is C n D?

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Example 2

• P 5, 10, 15, 20
• Q 8, 10, 18, 20
• Find P U Q

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Homework

• P. 233
• 1-8