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In this lesson, we will look into the notation for functions and how to obtain the value of a function.

**What is function notation?**

Functions are given letter names.

**Function Notation**

Throughout mathematics, we find function notation. Function notation is a way to write functions that is easy to read and understand. Functions have dependent and independent variables, and when we use function notation the independent variable is commonly x, and the dependent variable is f(x). In order to write a relation or equation using function notation, we first determine whether the relation is a function.
**Function Notation - A basic description of function notation and a few examples involving function notation.**

You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.

More Lessons for Algebra

Math Worksheets

In this lesson, we will look into the notation for functions and how to obtain the value of a function.

Functions are given letter names.

The names are of the form f(*x*) which is read “f of *x*”. The letter inside the parentheses, usually *x*, stand for the domain set.

The entire symbol, usually f(*x*), stands for the range set.

The ordered-pair numbers become (*x*, f(*x*)).

**Example:**

Given f(*x)* = *x*^{2} + 3*x* – 1, find

a) f(1)

b) f(–1)

c) f(*a*)

d) f(*x *– 1)

**Solution:**

a) f(1) = (1)^{2} + 3(1) – 1 = 3

b) f(–1) = (–1)^{2} + 3(–1) – 1 = –3

c) f(*a*) = *a*^{2} + 3*a* – 1

d) f(*x *– 1) = (*x* – 1)^{2} + 3(*x* – 1) – 1

= *x*^{2} – 2*x* + 1 + 3*x* – 3 – 1 = *x*^{2} + *x* –3

**Example:**

Give g(*x*) = *x*^{2} + 2, find

a) g(*a *+ *b*)

b) *g*(*x*^{2})

**Solution:**

a) g(*a *+ *b*) = (*a *+ *b*)^{2} + 2

*= a*^{2} + 2*ab* + *b*^{2} + 2

b) *g*(*x*^{2}) = (*x*^{2})^{2} + 2 = *x*^{4} + 2

Throughout mathematics, we find function notation. Function notation is a way to write functions that is easy to read and understand. Functions have dependent and independent variables, and when we use function notation the independent variable is commonly x, and the dependent variable is f(x). In order to write a relation or equation using function notation, we first determine whether the relation is a function.

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You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.

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