What is function notation? A function is in function notation when you use f(x) instead of y to indicate the outputs. You read f(x) as " f of x " or " f is a function of x "
Sometimes, the domain values (inputs) are related to the range values (outputs) with a rule. For example, take a look at the following situation.
Input | Function rule | Output |
2 | 3 times input + 1 | 7 |
3 | 3 times input + 1 | 10 |
You can just use x to represent the inputs and y to represent the outputs and write y = 3 times x + 1.
y = 3x + 1
The notation y = 3x + 1 is one way to write this function. However, as already stated, there is another way. It is the function notation or f(x) = 3x + 1.
Note that f(x) does not mean " f times x "
Suppose that the value of x is 6. You can write f(6) and f(6) is read " f of 6 " or " f is a function of 6 "
f(6) represents the value of the function at x = 6.
For the example above, f(x) = 3x + 1 and f(6) = 3 × 6 + 1 = 18 + 1 = 19
From the table above, notice that A(s) = s × s is the function notation for the area of a square.
The different ways we can read A(s) are:
Finally, notice from the table above, that the function notation P(x,y) = 2(x + y) has 2 variables. This is quite common when doing advanced math.
There is nothing wrong with the notation y = 3x + 1. However, it has some limitations.
Jul 03, 20 09:51 AM
factoring trinomials (ax^2 + bx + c ) when a is equal to 1 is the goal of this lesson.
Basic math formulas
Algebra word problems
New math lessons
Your email is safe with us. We will only use it to inform you about new math lessons.