https://mathbitsnotebook.com/Algebra1/Functions/FNNotationEvaluation.html

Traditionally, functions are referred to by single letter names, such as f, g, h and so on. Any letter(s), however, may be used to name a function. Examples:

Watch Sal work through a basic Function notation problem.

Dec 2, 2008 ... Function Notation - A basic d... ... Function Notation - A basic description of function notation and a few examples involving function notation.

http://www.algebra-class.com/function-notation.html

Learn how to use and read function notation in Algebra. ... For example, if you are writing an equation to calculate the square of x. You may write this as a ...

https://www.cliffsnotes.com/study-guides/algebra/algebra-ii/relations-and-functions/function-notation

An equation involving x and y, which is also a function, can be written in the form y = “some expression involving x”; that is, y = f ... Function Notation ... Example 1.

https://www.purplemath.com/modules/fcnnot.htm

Demystifies function notation, specifying that the parentheses do not indicate multiplication, and demonstrates how to evaluate a function at a number.

https://www.purplemath.com/modules/fcnnot2.htm

Demonstrates how to evaluate a function at a variable or variable expression. Gives examples of typical convoluted homework problems.

https://math.tutorvista.com/calculus/function-notation.html

The purpose of using the function notation is that we can write more information instead of using symbols, we can use just the variable y. For example, we ask ...