| Description | Example |
|---|---|
| Some functional relationships can be expressed with an equation. | y = 3x + 4 |
| Function notation puts the input or independent variable of a function in parentheses and names the function with a letter, in this case, f. |
f(x) |
| The function notation is equal to the dependent variable or output. This notation is read as "y equals f of x," and it means "y is a function of x," or "y is dependent on x." It is important to note, the parentheses in function notation do not represent multiplication. |
y = f(x) |
| The original equation can be written with function notation. This is read as "the function of x equals three x plus four," where x is the independent variable of a function named f. Function notation can only be used with functional relationships. |
f(x) = 3x + 4 |
The equation y = 5x − 7 is a function. How would it be written in function notation?
Interactive popup. Assistance may be required. f(x) = 5x – 7
Given y = one half 1 2 x + 3 and y = g(x), express this function, g, in function notation.
Interactive popup. Assistance may be required. g(x) =one half
1 2 x + 3