Few Important Details on Function Notation

The concept of functions was developed in the seventeenth century when Rene Descartes used the suggestion to version mathematical partnerships in his publication Geometry. The term “function” was then presented by Gottfried Wilhelm Leibniz fifty years later on after Geometry publication. Let’s learn more about Function Notation in this blog.

Later, Leonhard Euler defined functions when he introduced the principle of function symbols; y = f (x). Until 1837, Peter Dirichlet– a German mathematician– gave the modern-day interpretation of a function.

What is a Function?

In mathematics, a function is a collection of inputs with a solitary result in each case. Every function has a domain name and range. The domain name is the set of independent values of the variable x for a relation, or a function is defined. In short words, the domain is a set of x-values that create the actual values of y when substituted in the function.

On the other hand, the array collects all possible values that a function can generate. The series of a function can be expressed in interval symbols or educate of inequalities.

What is a Function Notation?

Symbols can be specified as a system of symbols or signs that denote aspects such as phrases, numbers, words, etc.

Therefore, a function symbol is a method in which can stand a function for utilizing symbols and indications. Function symbols are a more straightforward approach to explaining a function without a prolonged composed description.

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One of the most often utilized function symbols is f( x), which is read as “f” of “x.” In this instance, the letter x, positioned within the parentheses and the whole icon f( x), represents the domain collection and the variety explicitly set.

Although f is one of the most famous letters utilized when creating function notation, it can also make any other letter of the alphabet used either in the upper or reduced situation.

Benefits of using function notation

Considering that many functions are stood for with numerous variables such as; a, f, g, h, k, and so on, we use f( x) to stay clear of complications as to which function is being evaluated.

Function symbols permit to recognize the independent variable easily.

Function notation likewise helps us to identify the component of a function that has to be analyzed.

Take into consideration a direct function y = 3x + 7. To write such a function in function notation, we replace the variable y with the expression f( x) to obtain;

f( x) = 3x + 7. Then, this function f( x) = 3x + 7 is read as the value of f at x or as f of x.

How to solve function notation?

Function examination is the process of establishing outcome values of a function. This is done by replacing the input values in the given function symbols.


Create y = x2 + 4x + 1 making use of function symbols and also assess the function at x = 3.


Offered, y = x2 + 4x + 1

By using function symbols, we obtain

f (x) = x2 + 4x + 1


Alternative x with 3

f (3) = 32 + 4 × 3 + 1 = 9 + 12 + 1 = 22


Review the function f(x) = 3( 2x +1) when x = 4.


Plug x = 4 in the function f(x).

f (4) = 3 [2(4) + 1]

and, f (4) = 3 [8 + 1]

f (4) = 3 x 9

Hence, f (4) = 27

Types of functions

There are several sorts of functions in Algebra.

One of the most typical kinds of functions include:

Linear function

A linear function is a polynomial of the first degree. A linear function has the necessary kind of f( x) = ax + b, where an and b are mathematical values and a ≠ 0.

Quadratic function

A quadratic function is a polynomial function of the second level. The general form of a square function is f( x) = ax2 + bx + c, where a, b and c are integers as well as a ≠ 0.

Cubic function

This is a polynomial function of third degree which is of the kind f( x) = ax3 + bx2 + cx + d.

Logarithmic function

A logarithmic function is a formula in which a variable appears as an argument of a logarithm. The general function is f( x)= log an (x), where a is the base and x is the debate.

Exponential function

An exponential function is a formula in which the variable looks like a backer. Rapid function for f (x) = ax.

Trigonometric function

f (x) = transgression x, f (x) = cos x etc. are examples of trigonometric functions.

a. Identity Function:

An identity function is f: A → B and f (x) = x, ∀ x ∈ A.

b. Rational Function:

A function is logical if R (x) = P (x)/ Q (x), where Q (x) ≠ 0.

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