# Interval Notation Practice

Interval Notation Defined. There are numerous little tricks which can be used to simplify issues and data in math. Interval notation is one in all them. When we specific a suite of real numbers the usage ofFor each quantity line, write the given set of numbers in interval notation. 2—1 3- 2-1 Three 4 Four 3 6 Four 8 —15 —10 o —4 -2 o 2 2 4NAME: Put in interval notation AND draw a graph of every inequality. Practice: Interval Notation 00 ) 8. 10. 1. 2. 3. 4. 5. x < -10 Write each and every interval as anInterval Notation Interval Notation for Linear Inequalities A suite of numbers may be described in some ways; by means of the use of rosters, tables, number strains, and different strategies. A useful means of describing a suite of numbers is through the use of interval notation. Interval notation is a common approach to specific a set of numbers between two values, a and b.Intervals and interval notation. Practice: Domain and vary from graph. This is the lately selected item. Next lesson. Determining the area of a serve as. Worked instance: area and vary from graph. Our undertaking is to provide a unfastened, world-class schooling to anyone, anyplace.

## PDF INTERVAL NOTATION WORKSHEET - d51schools.org

Practice: Interval Notation . Use interval notation to describe the number(s) graphed on each and every quantity line. 1.Answer: Interval notation: (− ∞, 5] It is necessary to see that 5 ≥ x is equal to x ≤ 5.Both require values of x to be smaller than or equal to five. To steer clear of confusion, it's excellent practice to rewrite all inequalities with the variable at the left.One of the efficient techniques is the interval notation. To write interval notation, we express a set of actual numbers with a place to begin and an endpoint written within parenthesis or brackets. in other phrases, interval notation is used t write the subsets of real numbers. Before writing an interval notation, we want to perceive two issues.Interval Notation: (description) (diagram) Open Interval: (a, b) is interpreted as a < x < b the place the endpoints are NOT incorporated. (While this notation resembles an ordered pair, on this context it refers back to the interval upon which you're running.) (1, 5)

### PDF NAME: Put in interval notation AND draw a graph of each

Exercise Set 1.7: Interval Notation and Linear Inequalities 94 University of Houston Department of Mathematics For each of the following inequalities: (a) Write the inequality algebraically. (b) Graph the inequality on the actual number line. (c) Write the inequality in interval notation. 1. x is bigger than 5. 2. x is lower than 4.Introducing intervals, which can be bounded sets of numbers and are very helpful when describing area and vary. We can use interval notation to turn that a price falls between two endpoints. For example, -3≤x≤2, [-3,2], and -3≤x≤2 all imply that x is between -3 and a pair of and could be either endpoint. Google Classroom Facebook TwitterFor instance, through set-builder notation, through interval notation or via graphing on a bunch line. Interval notation is a technique of writing down a set of numbers. Identify proper interval notation for each and every set. "(" or ")" means now not incorporated or open "[" or "]" means "included" or "closed". Group: Algebra Algebra Quizzes : Topic: interval notationInterval Notation Examples: \\((4;12)\\) Round brackets indicate that the number is not incorporated. This interval comprises all real numbers more than howeverInterval notation is an important thought that students have traditionally had difficulty with. This set of job cards reinforces the relationship between interval notation, inequalities, and graphing on a number line. Included: 24 Task Card

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## 2.7 Introduction to Inequalities and Interval Notation

Learning Objectives Graph the solutions of a single inequality on a bunch line and specific the answers the use of interval notation. Graph the solutions of a compound inequality on a number line, and specific the solutions the usage of interval notation.

## Unbounded Intervals

An algebraic inequalityExpressions comparable with the symbols ≤, <, ≥, and >., corresponding to x≥2, is learn “x is larger than or equal to 2.” This inequality has infinitely many solutions for x. Some of the solutions are 2, 3, 3.5, 5, 20, and 20.001. Since it is not possible to list all the solutions, a device is needed that permits a transparent communique of this countless set. Two commonplace ways of expressing solutions to an inequality are by means of graphing them on a number lineSolutions to an algebraic inequality expressed by shading the solution on a host line. and the usage of interval notationA textual machine of expressing answers to an algebraic inequality..

To specific the solution graphically, draw a bunch line and color in the entire values that are answers to the inequality. Interval notation is textual and uses specific notation as follows:

Determine the interval notation after graphing the answer set on a bunch line. The numbers in interval notation must be written in the similar order as they appear at the number line, with smaller numbers in the set showing first. In this case, there's an inclusive inequalityAn inequality that comes with the boundary level indicated by means of the “or equal” part of the symbols ≤ and ≥ and a closed dot on the quantity line., this means that that the lower-bound 2 is integrated in the answer. Denote this with a closed dot at the quantity line and a square bracket in interval notation. The symbol (∞) is read as infinityThe image (∞) signifies the interval is unbounded to the appropriate. and indicates that the set is unbounded to the appropriate on a bunch line. Interval notation requires a parenthesis to surround infinity. The square bracket signifies the boundary is included in the answer. The parentheses indicate the boundary isn't incorporated. Infinity is an higher bound to the true numbers, but is not itself a real quantity: it cannot be integrated in the answer set.

Now compare the interval notation within the previous instance to that of the stern, or noninclusive, inequality that follows:

Strict inequalitiesExpress ordering relationships using the emblem < for “less than” and > for “greater than.” imply that solutions may get very on the subject of the boundary level, in this case 2, but not actually include it. Denote this idea with an open dot at the quantity line and a round parenthesis in interval notation.

Example 1: Graph and provides the interval notation identical: x<3.

Solution: Use an open dot at 3 and coloration all real numbers strictly less than 3. Use unfavorable infinityThe image (−∞) signifies the interval is unbounded to the left. (−∞) to suggest that the answer set is unbounded to the left on a bunch line.

Example 2: Graph and provides the interval notation an identical: x≤5.

Solution: Use a closed dot and coloration all numbers not up to and together with 5.

It is important to look that 5≥x is the same as x≤5. Both require values of x to be smaller than or equivalent to 5. To keep away from confusion, it is good practice to rewrite all inequalities with the variable on the left. Also, when the usage of text, use “inf” as a shortened type of infinity. For instance, (−∞, 5] may also be expressed textually as (−inf, 5].

A compound inequalityTwo inequalities in a single commentary joined by way of the word “and” or through the word “or.” is actually two or extra inequalities in a single commentary joined by means of the word “and” or via the word “or.” Compound inequalities with the logical “or” require that both condition should be glad. Therefore, the answer set of this sort of compound inequality is composed of all the components of the answer units of each inequality. When we join these person answer units it is named the unionThe set shaped by means of joining the individual resolution sets indicated by means of the logical use of the phrase “or” and denoted with the emblem ∪., denoted ∪. For instance, the solutions to the compound inequality x<3 or x≥6 can be graphed as follows:

Sometimes we come upon compound inequalities the place the separate answer units overlap. In the case where the compound inequality contains the word “or,” we mix all of the parts of each sets to create one set containing all of the parts of every.

Example 3: Graph and give the interval notation identical: x≤−1 or x<3.

Solution: Combine all answers of both inequalities. The answers to every inequality are sketched above the quantity line as a method to resolve the union, which is graphed on the number line beneath.

Any real quantity not up to 3 within the shaded area at the number line will satisfy a minimum of some of the two given inequalities.

Example 4: Graph and provides the interval notation an identical: x<3 or x≥−1.

Solution: Both answer sets are graphed above the union, which is graphed beneath.

Answer: Interval notation: R = (−∞, ∞)

When you combine each answer units and form the union, you'll see that every one actual numbers satisfy the unique compound inequality.

In abstract,

and

## Bounded Intervals

An inequality akin to

reads “−1 one is less than or equal to x and x is lower than 3.” This is a compound inequality as a result of it may be decomposed as follows:

The logical “and” requires that both prerequisites should be true. Both inequalities are satisfied via the entire parts within the intersectionThe set formed by the shared values of the person solution sets this is indicated by means of the logical use of the word “and,” denoted with the logo ∩., denoted ∩, of the answer sets of each.

Example 5: Graph and provides the interval notation similar: x<3 and x≥−1.

Solution: Determine the intersection, or overlap, of the 2 solution units. The solutions to every inequality are sketched above the quantity line as a way to decide the intersection, which is graphed at the number line under.

Here x=3 is not a solution as it solves handiest probably the most inequalities.

Alternatively, we would possibly interpret −1≤x<3 as all possible values for x between or bounded through −1 and three on a number line. For example, one such resolution is x=1. Notice that 1 is between −1 and 3 on a bunch line, or that −1 < 1 < 3. Similarly, we can see that different imaginable solutions are −1, −0.99, 0, 0.0056, 1.8, and a pair of.99. Since there are infinitely many real numbers between −1 and three, we should express the solution graphically and/or with interval notation, in this case [−1, 3).

Example 6: Graph and give the interval notation an identical: −32<x<2.

Solution: Shade all real numbers bounded through, or strictly between, −32=−112 and a couple of.

Example 7: Graph and give the interval notation an identical: −5<x≤15.

Solution: Shade all real numbers between −Five and 15, and indicate that the higher sure, 15, is integrated in the solution set via using a closed dot.

In the previous two examples, we did not decompose the inequalities; as a substitute we chose to think of all real numbers between the 2 given bounds.

In abstract,

## Set-Builder Notation

In this article, we use interval notation. However, different sources that you are more likely to come across use another way for describing sets referred to as set-builder notationA system for describing sets using familiar mathematical notation.. We have used set notation to list the elements such because the integers

The braces group the weather of the set and the ellipsis marks indicate that the integers proceed forever. In this section, we wish to describe durations of real numbers—for example, the actual numbers more than or equal to two.

Since the set is simply too large to checklist, set-builder notation allows us to explain it using familiar mathematical notation. An instance of set-builder notation follows:

Here x∈R describes the type of number, where the emblem (∈) is learn “component of.” This signifies that the variable x represents an actual number. The vertical bar (|) is learn “such that.” Finally, the observation x≥2 is the condition that describes the set the usage of mathematical notation. At this point in our find out about of algebra, it is assumed that each one variables represent actual numbers. For this reason, you'll be able to overlook the “∈R” and write x, which is learn “the set of all real numbers x such that x is greater than or equivalent to two.”

To describe compound inequalities equivalent to x<3 or x≥6, write x, which is read “the set of all real numbers x such that x is lower than Three or x is greater than or equal to 6.”

Write bounded durations, similar to −1≤x<3, as −1≤x<3, which is learn “the set of all actual numbers x such that x is bigger than or equivalent to −1 and less than 3.”

Key Takeaways Inequalities in most cases have infinitely many solutions, so slightly than presenting an impossibly massive list, we provide such solutions units either graphically on a host line or textually the use of interval notation. Inclusive inequalities with the “or equivalent to” part are indicated with a closed dot on the quantity line and with a square bracket using interval notation. Strict inequalities with out the “or equivalent to” element are indicated with an open dot at the number line and a parenthesis the usage of interval notation. Compound inequalities that employ the logical “or” are solved by answers of either inequality. The answer set is the union of each and every particular person resolution set. Compound inequalities that make use of the logical “and” require that all inequalities are solved by a single solution. The solution set is the intersection of each and every particular person answer set. Compound inequalities of the shape n<A<m may also be decomposed into two inequalities the use of the logical “and.” However, it is just as legitimate to consider the argument A to be bounded between the values n and m. Topic Exercises

Part A: Simple Inequalities

Graph all answers on a number line and give you the corresponding interval notation.

1. x≤10

2. x>−5

3. x>0

4. x≤0

5. x≤−3

6. x≥−1

7. −4<x

8. 1≥x

9. x<−12

10. x≥−32

11. x≥−134

12. x<34

Part B: Compound Inequalities

Graph all answers on a host line and provides the corresponding interval notation.

13. −2<x<5

14. −5≤x≤−1

15. −5<x≤20

16. 0≤x<15

17. 10<x≤40

18. −40≤x<−10

19. 0<x ≤50

20. −30<x<0

21. −58<x<18

22. −34≤x≤12

23. −1≤x<112

24. −112<x<−12

25. x<−3   or   x>3

26. x<−2   or   x≥4

27. x≤0   or   x>10

28. x≤−20   or  x≥−10

29. x<−23   or   x>13

30. x≤−43   or   x>−13

31. x>−5  or  x<5

32. x<12  or  x>−6

33. x<3  or  x≥3

34. x≤0  or  x>0

35. x<−7  or  x<2

36. x≥−3  or  x>0

37. x≥5  or  x>0

38. x<15  or  x≤10

39. x>−2   and   x<3

40. x≥0   and  x<5

41. x≥−5   and  x≤−1

42. x<−4   and   x>2

43. x≤3  and  x>3

44. x≤5   and   x≥5

45. x≤0   and   x≥0

46. x<2   and   x≤−1

47. x>0    and   x≥−1

48. x<5   and   x<2

Part C: Interval Notation

Determine the inequality given the answers expressed in interval notation.

49. (−∞, 7]

50. (−4, ∞)

51. [−12, ∞)

52. (−∞, −3)

53. (−8, 10]

54. (−20, 0]

55. (−14, −2)

56. [23, 43]

57. (−34, 12)

58. (−∞, −8)

59. (8, ∞)

60. (−∞, 4)∪[8, ∞)

61. (−∞, −2]∪[0, ∞)

62. (−∞, −5]∪(5, ∞)

63. (−∞, 0)∪(2, ∞)

64. (−∞, −15)∪(−5, ∞)

Write an similar inequality.

65. All real numbers less than 27.

66. All real numbers less than or equivalent to zero.

67. All real numbers greater than 5.

68. All real numbers greater than or equivalent to −8.

69. All real numbers strictly between −6 and 6.

70. All actual numbers strictly between −80 and 0.

Part D: Discussion Board Topics

71. Compare interval notation with set-builder notation. Share an instance of a suite described the use of each systems.

72. Explain why we do not use a bracket in interval notation when infinity is an endpoint.

73. Research and speak about the other compound inequalities, particularly unions and intersections.

74. Research and discuss the history of infinity.

75. Research and talk about the contributions of Georg Cantor.

76. What is a Venn diagram? Explain and submit an instance.

1: (−∞, 10]

3: (0, ∞)

5: (−∞, −3]

7: (−4, ∞)

9: (−∞, −12)

11: [−134, ∞)

13: (−2, 5)

15: (−5, 20]

17: (10, 40]

19: (0, 50]

21: (−58, 18)

23: [−1, 112)

25: (−∞, −3)∪(3, ∞)

27: (−∞, 0]∪(10, ∞)

29: (−∞, −23)∪(13, ∞)

31: R

33: R

35: (−∞, 2)

37: (0, ∞)

39: (−2, 3)

41: [−5, −1]

43: ∅

45: 0

47: (0, ∞)

49: x≤7

51: x≥−12

53: −8<x≤10

55: −14<x<−2

57: −34<x<12

59: x>8

61: x≤−2  or  x≥0

63: x<0  or  x>2

65: x<27

67: x>5

69: −6<x<6