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Last updated date: 21st May 2024
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Introduction to Constant

A constant term, to broaden our definition, is one that does not change. It's either a single number or a symbol that represents a known number. A letter such as a, b, or c can be used as the replacement for a constant.

The mathematical symbol Pi is an example of a constant term. Pi is a phrase denoting a known number that can stand on its own.

Let's look at several definitions to see what a constant is and how it differs from other concepts and numbers in math:

  • A number is a unit of measurement in the mathematical system that we use to count, add, subtract, and perform other operations. 1, 2, 3, 4, 5, 6, and so on are some examples of numbers.

  • A variable is a number that is subject to change. It is the polar opposite of a fixed number, which is a constant. x, y, and z are examples of variables.

  • A coefficient is a numerical value placed in front of a variable. If it does not change, it is sometimes referred to as a constant.

  • Addition, subtraction, multiplication, and division are the four mathematical operations.

  • A mathematical expression is a set of operations that includes both constant terms and variables.

From the above-mentioned facts, we can conclude that:

A constant is a number that remains constant across time, such as 1, 2, 3, 4, or even 0.3 or 34. There are no variables besides the number, therefore it stands alone.

Introduction to Constant

In Mathematics, Algebra is a branch that deals with symbols, constants, variables, numbers and the rules for manipulating them. The mathematical relationship is used to find the unknown value by creating expressions and equations. A mathematical constant is a key number whose value is determined by a symbol, or by the names of mathematicians, to make it easier to use across various mathematical problems. Constants exist in many fields of mathematics, with constants such as e and Π appearing in such varied ways as geometry, number theory, and calculus.

In this article, we will discuss the constant, constant value and what is a constant term in Maths along with a constant example. 

What is Constant?

In mathematics, a constant is a specific number or a symbol that is assigned a fixed value. In other words, a constant is a value or number that never changes in expression. Its value is constantly the same. Examples of constant are 2, 5, 0, -3, -7, 2/7, 7/9 etc.

A few more constant examples are :

  • The number of days in a week represents a constant.

  • In the expression 5x + 10, the constant term is 10.

  • In 2a, 2 is a constant

  • In -7mn, -7 is a constant 

  • In 3x, 3 is constant

Constant value is a fixed value. In Algebra, a constant is a number, or sometimes it is denoted by a letter such as a, b or c  for a fixed number. For example x+2=10, here 2 and 10 are constants.

What is the Constant Term?

A constant term in mathematics is a term in an algebraic equation whose meaning is constant or cannot change because it has no modifiable variables. For example, in the quadratic polynomial x² + 2x + 3 = 0, the term 3 is a constant. Let’s understand this with an algebraic expression.

Consider the algebraic expression, 2x-5=10, in equations 5 and 10 are constant terms.

What is the Constant Number?

A constant number in math is a value that doesn't change. Instead, it's a fixed value. All numbers are considered constant numbers. Why is that? Let’s understand this with an example. If you see the below problem,

5+ 5 = ?

Here we need to add 5 and 5 together. Here, 5 will always stand for the number 5 and not some other number. Hence the value is always fixed.

Therefore 5+5=10. 10 is also a constant number.

As we have discussed constant, examples of constant numbers and a few solved problems based on constant terms. We can conclude that a constant is a specific number and its value is always fixed.

Constants v/s Variables

These are mostly symbols that serve as placeholders for values. Variables are typically represented by letters and do not have a set value. A variable's value is unique and might differ from one circumstance to the next. In algebraic expressions, variables and constants are commonly used. The difference between the two is presented in a tabular format, as seen in the table below:

Constants V/S Variables



The value of a constant does not vary over time.

The value of a variable, on the other hand, is determined by the equation.

Numbers are commonly used to represent constants.

Variables are uniquely written in letters or symbols.

Constants are used to represent known values in an equation, expression, or programming line.

Variables, on the other hand, indicate unknown values.

Constant Recognition in Algebra

If we know the fundamental concept of a constant, which is a number having a fixed value, even if that value is unknown, we can detect it in a variety of mathematical formulations. The following are some instances of algebraic constants to be aware of:

  • Numbers that stand alone.

  • Variables have a fixed value that represents unknown numbers (a, b, c). If x, y, and z can be found by solving the equation in which they appear and if they equal one integer, they are constants.

  • Irrational numbers, such as Pi, are represented by symbols.

  • Fractions, decimals, and whole numbers are all acceptable.

  • An exponent isn't a constant term. Because it merely shows how many times we multiply a number by itself, the exponent is not a constant.

Solved Examples

1. Is 5 a Constant Number?

Ans: As we know the constant number has a fixed numerical value. Here, 5 is a fixed value hence it is a constant number.

2. What is the Constant Term in the Expression 3x+5=15?

Ans: The constant has a fixed value. So, in the above expression, 5 and 15 are fixed values. Hence, 5 and 15 are the constant terms of the expression 3x+5=15.

FAQs on Constant

1. Is Constant a Term?

A single mathematical expression is referred to as a term. It may be a single number (positive or negative), a single variable (a letter), or a combination of variables multiplied but never inserted or subtracted. Variables with a number in front of them appear in certain terms. A coefficient is a number that appears in front of a term. An example of a constant is '5', where it won't be affected because of variables. The coefficient of a term made up entirely of variables is 1. The expressions in an algebraic equation that contain only numbers are known as constants. That is, they are the terms that do not have any variables. They are called constants because their value does not change. After all, there are no variables in the term that can alter it.

2. What is a Constant Term in Math?

In mathematics, a constant term is a term in an algebraic expression whose value is fixed or cannot change, because it does not contain any modifiable variables. A constant term, with a constant applied as a multiplicative coefficient, also represents a constant term, as the component is not yet present in the new term. Since the expression is updated, the term (and coefficient) classifies itself as constant. For example, in the quadratic polynomial 2x2 + 5, 5 is a constant term.

3. What Does Constant Mean?

In math and science, a constant is a number that is fixed and known, unlike a variable that changes with the context. The value of a function that remains unchanged (i.e., a constant function). Such a constant is usually expressed by a variable that does not depend on the key variable(s) in question. This is the case, for example, for a constant integration, which is an arbitrary constant function applied to a particular antiderivative to get all the anti-derivatives of the given function.

4. What is the significance of Constant in Maths?

Any mathematical constant is a significant integer whose value is fixed by an unambiguous definition. It is commonly denoted by a symbol (e.g., an alphabet letter) or by the names of mathematicians to make it easier to use across many issues. Constants appear in a variety of situations in mathematics, with constants like e and appearing in disciplines as disparate as geometry, number theory, and calculus.

What it implies for a constant to "arise organically," and what makes a constant "interesting," is ultimately a question of personal preference, with certain mathematical constants being remarkable more for historical reasons than for their inherent mathematical appeal. The more well-known constants have been examined and calculated to many decimal places throughout history. All mathematical constants are defined and, in most cases, computable numbers.

5. Who discovered the constant Pi and its value?

Archimedes of Syracuse (287– 212 BC), one of the finest mathematicians of the ancient world, was the first to calculate the value of Pi. Archimedes calculated the area of a circle by calculating the areas of two regular polygons: the polygon inscribed within the circle and the polygon within which the circle was circumscribed, using the Pythagorean Theorem. The areas of the polygons provided upper and lower boundaries for the size of the circle since the actual area of the circle is between the areas of the inscribed and circumscribed polygons. Archimedes was well aware that he had simply obtained an estimate within certain bounds, not the value of. Archimedes demonstrated that lies between 3 1/7 and 3 10/71 in this method.