# Compound Inequalities. Section 3-6

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1 Compound Inequalities Section 3-6

2 Goals Goal To solve and graph inequalities containing the word and. To solve and graph inequalities containing the word or.

3 Vocabulary Compound Inequality Interval Notation

4 Definition The inequalities you have seen so far are simple inequalities. When two simple inequalities are combined into one statement by the words AND or OR, the result is called a compound inequality. Compound Inequality the result of combining two inequalities. The words and and or are used to describe how the two parts are related.

5 Venn Diagram and Compound Inequalities In this diagram, set A represents some integer solutions of x < 10, and set B represents some integer solutions of x > 0. The overlapping region represents numbers that belong in set A and set B. Those numbers are solutions of both x < 10 and x > 0 (can be written 0 < x < 10).

6 Number Line and Compound Inequalities You can graph the solutions of a compound inequality involving AND by using the idea of an overlapping region. The overlapping region is called the intersection and shows the numbers that are solutions of both inequalities.

7 Venn Diagram and Compound Inequalities In this diagram, set A represents some integer solutions of x < 0, and set B represents some integer solutions of x > 10. The combined shaded regions represent numbers that are solutions of either x < 0 or x >10 (or both).

8 Number Line and Compound Inequalities You can graph the solutions of a compound inequality involving OR by using the idea of combining regions. The combined regions are called the union and show the numbers that are solutions of either inequality. >

9 Compound Inequalities

10 Example: Write a compound inequality for each statement. A. A number x is both less than 4 and greater than or equal to x < 4 B. A number t is either greater than 1 or less than or equal to 7. t > 1 or t 7

11 Your Turn: Write a compound inequality for each statement. A. A number t is both greater than 9 and less than or equal to < t 18.5 B. A number y is either greater than 5 or less than or equal to 1. y > 5 or y 1

12 Writing Math The and compound inequality y < 2 and y < 4 can be written as 2 < y < 4. The or compound inequality y < 1 or y > 9 must be written with the word or.

13 Example: Writing Compound Inequalities Write the compound inequality shown by the graph. The shaded portion of the graph is not between two values, so the compound inequality involves OR. On the left, the graph shows an arrow pointing left, so use either < or. The solid circle at 8 means 8 is a solution so use. x 8 On the right, the graph shows an arrow pointing right, so use either > or. The empty circle at 0 means that 0 is not a solution, so use >. x > 0 The compound inequality is x 8 OR x > 0.

14 Example: Writing Compound Inequalities Write the compound inequality shown by the graph. The shaded portion of the graph is between the values 2 and 5, so the compound inequality involves AND. The shaded values are on the right of 2, so use > or. The empty circle at 2 means 2 is not a solution, so use >. m > 2 The shaded values are to the left of 5, so use < or. The empty circle at 5 means that 5 is not a solution so use <. m < 5 The compound inequality is m > 2 AND m < 5 (or 2 < m < 5).

15 Your Turn: Write the compound inequality shown by the graph. The shaded portion of the graph is between the values 9 and 2, so the compound inequality involves AND. The shaded values are on the right of 9, so use > or. The empty circle at 9 means 9 is not a solution, so use >. x > 9 The shaded values are to the left of 2, so use < or. The empty circle at 2 means that 2 is not a solution so use <. x < 2 The compound inequality is 9 < x AND x < 2 (or 9 < x < 2).

16 Your Turn: Write the compound inequality shown by the graph. The shaded portion of the graph is not between two values, so the compound inequality involves OR. On the left, the graph shows an arrow pointing left, so use either < or. The solid circle at 3 means 3 is a solution, so use. x 3 On the right, the graph shows an arrow pointing right, so use either > or. The solid circle at 2 means that 2 is a solution, so use. x 2 The compound inequality is x 3 OR x 2.

17 Example: Application The ph level of a popular shampoo is between 6.0 and 6.5 inclusive. Write a compound inequality to show the ph levels of this shampoo. Graph the solutions. Let p be the ph level of the shampoo. 6.0 is less than or equal to ph level is less than or equal to 6.0 p p

18 The free chlorine in a pool should be between 1.0 and 3.0 parts per million inclusive. Write a compound inequality to show the levels that are within this range. Graph the solutions. Let c be the chlorine level of the pool. 1.0 is less than or equal to Your Turn: chlorine is less than or equal to 1.0 c c

19 Example: Solving and Compound Inequalities Solve the compound inequality and graph the solutions. 5 < x + 1 < 2 5 < x + 1 AND x + 1 < < x AND x < 1-6 < x < 1 Since 1 is added to x, subtract 1 from each part of the inequality. The solution set is {x: 6 < x AND x < 1}. Graph -6 < x <

20 Example: Solving and Compound Inequalities Solve the compound inequality and graph the solutions. 8 < 3x < 3x < 3x 12 3 < x 4 Since 1 is subtracted from 3x, add 1 to each part of the inequality. Since x is multiplied by 3, divide each part of the inequality by 3 to undo the multiplication. The solution set is {x:3 < x 4}

21 Your Turn: Solve the compound inequality and graph the solutions. 9 < x 10 < 5 9 < x 10 < < x < 5 Since 10 is subtracted from x, add 10 to each part of the inequality. The solution set is {x:1 < x < 5}. 1 < x < 5 Graph 1 < x <

22 Your Turn: Solve the compound inequality and graph the solutions. 4 3n + 5 < n + 5 < n < 6 3 n < 2 Since 5 is added to 3n, subtract 5 from each part of the inequality. Since n is multiplied by 3, divide each part of the inequality by 3 to undo the multiplication. The solution set is {n: 3 n < 2}. Graph -3 x <

23 Example: Solving or Compound Inequalities Solve the compound inequality and graph the solutions. 8 + t 7 OR 8 + t < t 7 OR 8 + t < t 1 OR t < 6 t < -6 or t -1 Solve each simple inequality. The solution set is {t: t 1 OR t < 6}. Graph t < -6 or t

24 Example: Solving or Compound Inequalities Solve the compound inequality and graph the solutions. 4x 20 OR 3x > 21 4x 20 OR 3x > 21 Solve each simple inequality. The solution set is {x:x 5 OR x > 7 }. x 5 OR x > 7 Graph x 5 or x >

25 Your Turn: Solve the compound inequality and graph the solutions. 2 +r < 12 OR r + 5 > r < 12 OR r + 5 > r < 10 OR r > 14 Solve each simple inequality. The solution set is {r:r < 10 OR r > 14}. r < 10 or r > 14 Graph the union by combining the regions

26 Your Turn: Solve the compound inequality and graph the solutions. 7x 21 OR 2x < 2 7x 21 OR 2x < 2 x 3 OR x < 1 x < -1 or x 3 Solve each simple inequality. The solution set is {x:x 3 OR x < 1}. Graph x < -1 or x

27 Interval Notation Interval Notation: Describes an interval on the number line. Interval Notation includes the use of three special symbols: ( ) [ ]

28 Interval Notation Parentheses ( ) are used when a < or > symbol indicates that the interval s endpoint is NOT included.

29 Interval Notation Brackets [ ] are used when a or symbol indicates that the interval s endpoint IS included.

30 Infinity is used when the interval continues forever in a positive direction and is used when the interval continues forever in a negative direction.

31 What is the graph of [-4, 6)? How do you write [-4, 6) as an inequality? SOLUTION This inequality is also written as -4 < x < 6.

32 Interval Notation What is the graph of x < -1 or x > 2? How do you write this in interval notation? SOLUTION In interval notation, this is written as (, 1] or (2, ).

33 Joke Time What is Beethoven doing in his grave? De-composing What do you call an arrogant household bug? A cocky roach. What's orange and sounds like a parrot? A carrot!

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