The Interval Notation Calculator is a free online tool. However, it displays the number line for a given interval. Also, the online interval notation calculator tool accelerates the calculation. Also, it displays the number line and inequality form in seconds. Moreover, the Interval Notation Calculator computes the length of any interval between two integers. Then, it represents the inequality based on the topology chosen. Moreover, Interval notation is a method of expressing real number line subsets. In this article, we are talking about this calculator.

So, keep reading to know more about it.

Table of Contents

**Interval Notation calculator definition**

In mathematics, an interval is the set of real numbers that lie between two integers. The three most common approaches for representing intervals are:

- Interval Notation Method
- Number Line Method
- Inequalities Method

However, the starting and ending numbers in the interval notation method will be represented by brackets. Then, there are two kinds of brackets: square brackets and round brackets. Then, the end values are included if the interval is enclosed in square brackets. Also, the end values are not included if the interval is given in round brackets.

[7, 12] As an example: It denotes the range of values from 7 to 12, with 7 excluded and 12 included.

Similarly, inequalities such as greater than, less than, more than or equal to, less than or equal to can be used to describe intervals. Then, if a circle is filled in a number line representation, it signifies that the final value is included. Then, the final value is not included if a circle is an open circle. Moreover, Interval Notation Calculator is a free online application that displays the supplied gap on a number line, expresses the inequality using the defined topology, and calculates the length of the interval between two numbers. Enter the values in the input fields to use the interval notation calculator.

**Interval notation calculator with steps**

Using the online interval notation calculator, follow the steps below to get the length of the interval, its number line representation, and the inequality based on the specified topology.

- Navigate to any interval notation calculator online.
- Then, choose a topology from the drop-down menu and enter the numbers into the appropriate input fields.
- Then, press the “Calculate” button to get the length, number line representation, and inequality of the interval.
- Finally, select “Reset” to clear the fields and input new values.

**Interval Notation Calculator from equation**

**Plot the number line interval [2, 4], define the inequality, topology, and length. Use the online interval notation calculator to double-check your results.**

Solution:

Inequality = 2 inequality x inequality 4

Closed Interval = Topology

Length = 4 minus 2 = 2

**Draw the interval [-3, 1) on a number line, define the inequality, topology, and length. Use the online interval notation calculator to double-check your results.**

Solution:

Inequality = -3 inequality x less than 1

Left closed, right open is the topology.

Length = 1 minus (-3) = 4

Similarly, the interval notation calculator may be used to determine the number line representation, inequalities, topologies, and length for the following intervals:

[-5, -2] (5, 9)

**Interval Notation Calculator domain**

A domain in mathematics is the set of potential values “x” of a function that will result in the output value “y.” It is the collection of independent variables’ potential values. The set of resultant values of the dependent variable is the range of a function. When the x values are substituted, this is the set of output values. It is similar in that when the input values are passed to the function, the output is produced.

In summary, a domain is the set of values for the function f(x), whereas a range is the set of values that the function accepts. The domain is the replacement set, while the range is the solution set.

**Example 1**

**f(x)=1/x^2 – 1**

The only thing we really have to worry about is the denominator being zero. So, we know x squared minus one cannot equal zero. This means x squared cannot equal one. Then, if we take the square root of both sides, x cannot equal plus or minus one. So, when we go to write our domain in interval notation, we are going to be able to go from infinity. Also, we are gonna go all the way to the negative one.

(- infinity, – 1) union (-1, 1) union (1, infinity)

So, this is our domain.

**Example 2**

**f(x)=2 by root over 3x+5**

In this equation, we have a square root as well and we don’t have a negative radical. We know that 3x plus five cannot be zero. It has to be strictly greater than zero. It must be positive. Also, it can’t be negative because of the radical and it can’t be zero because it is in a denominator. So, solving this for x, we get that three x has to be greater than negative five. Also, we get that x has to be greater than negative five thirds, dividing both sides by three. So, to write the domain in interval notation, it’s gonna start at negative five thirds and go up to infinity. Infinity always gets a parenthesis. The only question is whether or not we want to include negative five thirds, we don’t.

(-5/3, infinity)

So, that also gets a parenthesis and there’s our domain.

**Interval Notation Calculator graph**

A function is called a real function if its domain and range are both sets of real numbers. Many of the functions you’ve probably seen before are actual functions, and many of them have Domain = R. Consider the function y=3x as an example. This function’s graph is illustrated in sections below.Read Also: Discriminant Calculator: Definition, equation

You may already be familiar with line graphs. Then, you may already be in the habit of inserting arrows at the ends of sentences. Moreover, this is done to show that the line will continue indefinitely in both positive and negative directions, in terms of both domain and range. The line above, on the other hand, solely depicts the function y=3x on the interval [-3, 3]. The square brackets show that the graph contains the interval’s ends, x = -3 and x = 3. This is referred to as a closed interval. The endpoints of a closed interval are contained inside it. An open interval, on the other hand, does not have ends. With parenthesis, we denote an open interval.

For instance, (-3, 3) denotes the range of values between -3 and 3, excluding -3 and 3. You may have observed that the open interval notation resembles the notation for a planar point (x, y). It is critical to carefully examine an example or a homework assignment to avoid mixing a point with an interval! The context typically makes the distinction fairly evident.

**Example 1**

You were given a dilemma earlier regarding buying tacos for lunch.

You have $15 to spend on lunch, and tacos cost $1.25 apiece. The total cost would obviously be graphed as a function of the number of tacos purchased, but how would you specify that the graph not contain numbers larger than $15 or less than $3.75 (one taco each)?

To indicate that the cost of lunch graph only includes values between $3.75 and $15.00, set the domain interval to [3.75, 15].

**Example 2**

Identify the following sets:

(−3,9]

The range of integers between -3 and 9, excluding the exact value of -3 but encompassing 9.

[−23,12]

The range of integers from -23 to 12, “containing” the values -23 and 12.

(infinity,0) All numbers less than or equal to zero, excluding 0 itself.

**Example 3**

Use interval notation to describe the specified intervals:

All of the positive numbers (0,+ infinity)

Because zero is neither positive nor negative. Because there is no maximum positive number, we declare infinity as the top value and use the symbol “” to indicate that it cannot be achieved.

The numbers between -eight and -two hundred forty-two, inclusive.

[−8,242]

Because both values are included, the “[” is used on both ends.

All negative numbers, zero, and positive numbers from one to nine.

(−∞,9]

The “(” indicates that negative infinity cannot be achieved, while the “]” indicates that 9 is included in the set.

**Interval notation calculator chart**

Interval notation |
Inequality notation |
Description |

[a,b]
[a,b] |
A inequality x inequality b
A inequality inequality b |
The value of x is between a and b, including a and b, where a, b are real numbers. |

(a,b)
(a,b) |
a less than x less than b
a less than x less than b |
The value of x is between a and b, not including a and b. |

[a,b)
[a,b) |
A inequality x less than b
A inequality x less than b |
The value of x is between a and b, including a, but not including b. |

(a,b]
(a,b] |
a less than x inequality b
a less than x inequality b |
The value of x is between a and b, including b, but not including a. |

(a,∞)
(a,∞) |
x>a
x>a |
The value of x is strictly greater than a. |

[a,∞)
[a,∞) |
x≥a
x≥a |
The value of x is greater than or equal to a |

(−∞,a)
(−∞,a) |
x less than a
x less than a |
The value of x is strictly less than a |

(−∞,a]
(−∞,a] |
X inequality a
X inequality a |
The value of x is less than or equal to a. |

**Interval notation calculator inequality**

The set of real numbers that lie between any two given real numbers. Interval notation represented it. Intervals can depict inequalities. Intervals has four categories. If we have two endpoints, x and y, and x y, then the intervals can be categorised as follows:

**Open Interval**

The two ends are not included in this. If we have a number, z, that is between x and y, the inequality is written as x z y. An open interval is denoted by round brackets, i.e. (x, y).

**Closed interval**

This interval encompasses both endpoints. The inequality is written as x z y. Closed intervals, i.e., [x, y], are expressed using square brackets.

**Right Interval Half-Closed**

Only the left endpoint is included in this form of interval, whereas the right endpoint is omitted. The inequality is x z y. The left side of the interval is enclosed by a square bracket, whereas the right side is enclosed by a round bracket, i.e., [x, y].

In this interval, just the right endpoint is included, while the left is omitted. The inequality will be x z y. The left side uses a round bracket, while the right side employs a square bracket, i.e., (x, y).

The length of the distance between x and y may be determined as follows:

Length = y minus x.

**Interval notation calculator union**

A U B (we can read it as “A or B” (or) “A union B”) denotes a set that contains all of the components of A and B. To get the union of two sets A and B, use the union B formula. Simply placing all of A and B’s elements in one set and deleting duplicates yields the union. In other words, It is possible to calculate A U B without using the A union B formula.

Assume we have two sets, A and B. A U B is now made up of components from both sets A and B, chosen one at a time (leaving duplicates). The following are our representations:

- n(A U B) = the total number of elements in A U B
- n(A) denotes the number of items in A.
- n(B) denotes the number of items in B.
- n(A ∩ B) = The number of items that are shared by both A and B.

The sum of n(A) and n(B) indicates the total number of items in A and B, including common elements. This means that the number of components in common is tally twice.

To balance this and ensure that all components tallied only once, we deduct n(A ∩B) from n(A) + n(B), and so the formula for the number of elements in A U B is:

n(A U B) = n(A) + n(B) – n(A ∩B)

**Example 1**

Find A U B if A = 1, 2, 3, 4, and B = 2, 3, 6, 7.

Given this, the solution is:

A = 1, 2, 3, 4, 5

B = 2, 3, 6, 7, 8

Then, using the A union B formula, we can obtain A U B simply by recording all of A and B’s components in one set while avoiding duplicates.

As a result, A U B = 1, 2, 3, 4 1, 2, 3, 4, 6, 7 = 1, 2, 3, 4, 6, 7

The components in the answer set do not have to be in any particular sequence.

A U B = 1, 2, 3, 4, 6, 7, 8.

**Example 2**

Determine the chance of drawing an ace or a black card at random from a deck of 52 playing cards.

Solution: We know that there are 26 red cards and 26 black cards in a deck of 52 playing cards, as well as four aces, two of which are red and two of which are black.

Let A represent receiving an ace and B represent receiving a black card. Then, A ∩ B is the occurrence of receiving a black ace card.

P(A) = 4/52 = 1/13 P(A) = 4/52 = 1/13 P(A) = 4/

Then, P(B) = 26/52 = half

Then, P(A) = 2/52 = 1/26

As a result, the probability of receiving an ace or a black card is P(A U B), which is,

P(A) + P(B) – P(A ∩ B)

=4/52 + 26/52 – 2/52

=28/52

=7/13

As a result, the needed probability is 7/13.

**Interval notation calculator Math**

**A person must be at least 35 years old to be elected President of the United States. Give an interval to represent this data.**

Solution:

Let’s use A to symbolise the president’s age.

A’s age should be at least 35.

This indicates that A must be bigger than or equal to 35.

As a result, the inequality, A ≥ 35, represents this.

As a result, the needed interval is [35, infinity].

**A school’s participation in an Olympiad exam requires a minimum of ten pupils. Use interval notation to represent this.**

Solution:

If x represents the number of pupils in a class, x should be larger than or equal to 10.

This translates to x ≥10

[10,infinity] is the interval notation.

As a result, [10,infinity] represents the number of pupils.

**Lola needs at least 1500 calories per day, but her calorie intake should not surpass 1800. Using interval notation, represent the total number of calories she might consume.**

Solution:

Let’s double the quantity of calories by x.

1500 inequality x inequality 1800 gives the inequality expressing the potential number of calories.

The interval notation [1500, 1800] denoted the inequality.

[1500, 1800] is the needed interval notation.

**Some frequently asked questions**

**What is interval notation in math?**

Interval notation is a method of expressing real number line subsets. A closed interval is one that contains its ends, for as the set {x | −3inequalityxinequality1}. We use closed brackets []: [3,1] to represent this interval in interval notation.

**What is an interval example?**

An interval scale has order, and the difference between two numbers is significant. Temperature (Farenheit), temperature (Celcius), pH, SAT score (200-800), and credit score are examples of interval variables (300-850).

**What is Interval Notation Calculator?**

However, the Interval Notation Calculator is a free online tool. However, it displays the number line for a given interval. Also, the online interval notation calculator tool accelerates the calculation. Also, it displays the number line and inequality form in seconds. Moreover, the Interval Notation Calculator computes the length of any interval between two integers. Then, it represents the inequality based on the topology chosen. Moreover, Interval notation is a method of expressing real number line subsets.

**What does U mean in interval notation?**

A U B (we can read it as “A or B” (or) “A union B”) denotes a set that contains all of the components of A and B. To get the union of two sets A and B, use the union B formula. Simply placing all of A and B’s elements in one set and deleting duplicates yields the union. In other words, It is possible to calculate A U B without using the A union B formula.

**How do you do intervals on TI 84?**

- Select the Z Interval.
- Scroll down to TESTS after pressing Stat.
- Enter the required information.
- The calculator will request the following data:
- Analyse the results.
- When you press ENTER, the population mean’s 95 percent confidence interval will be shown.

**What is interval measurement?**

An interval measure is one in which the distance between the characteristics, or answer alternatives, has a real meaning and is of equal length. Variations in the values indicate variations in the property. The difference between 3 and 4 is equivalent to the difference between 234 and 235.

**What is the interval of data in the graph?**

An interval is the space between each value on a bar graph’s scale. In other words, the interval is the relationship between the units you’re using and their graph representation, or the distance between markers. You select intervals depending on the data set’s value range.

**What’s a 90 confidence interval?**

You have a 10% probability of being mistaken with a 90% confidence interval. A 95% confidence interval would be wider than a 95% confidence interval (for example, plus or minus 4.5 percent instead of 3.5 percent).

**What is an example of an Interval notation calculator?**

**f(x)=1/x^2 – 1**

The only thing we really have to worry about is the denominator being zero. So, we know x squared minus one cannot equal zero. This means x squared cannot equal one. Then, if we take the square root of both sides, x cannot equal plus or minus one. So, when we go to write our domain in interval notation, we are going to be able to go from infinity. Also, we are gonna go all the way to the negative one.

(- infinity, – 1) union (-1, 1) union (1, infinity)

So, this is our domain.