## What is the Domain and Range of a Function?

1) The Domain is defined as the set of all possible x-values that can be plugged into a function.
2) The Range of a function is defined as the set of all resulting y values.

### Example: Find the Domain and Range of $$y = \sqrt(x-3)$$ with Steps and Explanations.

1) The Domain is defined as the set of x-values that can be plugged into a function. In the above example, we can only plug in x-values greater or equal to 3 into the square root function avoiding the content of a square root to be negative.
Thus, domain is $$x>=3$$ .
Using Interval Notation we write: $$[3,\infty )$$

2) The Range of a function is defined as the set of all resulting y values. In the above example, the lowest y coordinate is y=0 achieved when x=3 is plugged in. The larger the x value plugged in the larger the y coordinate we obtain.
Thus, the range is $$y>=0$$.
Using Interval Notation we write: $$[0,\infty )$$

## Fastest Domain and Range Calculator

Find the Domain and Range for any Function in a matter of seconds.

## How do I use the Domain and Range Calculator?

Just enter your Function and press the “Calculate Domain and Range” button. The Domain and Range will be displayed in a new window.

### What's another way to think of Domain and Range?

1) The Domain are the x-values going left (from the smallest x-value) to right (to the largest x-value).

2) The Range are the y-values going from lowest (from the smallest y-value) to highest (to the largest y-value).

TiNspire CX Owners: How to Find Domain and Range using the TI-Nspire Calculator

Domain and Range Calculator

### What are Domain and Range of a constant function? In Example y=6 .

1) The Domain is all real numbers. Any number can be plugged into y=6.

2) The Range is just y=6. The lowest and highest y are both 6.

Is there a Video that helps me find the Domain and Range?
Yes of course. Watch this Khan Academy Video on how to solve Domain and Range Problems.

Online Calculators with Steps (Free)