Question

What is the easiest way to determine the domain and range of a function and of a graph?

Can you give me some examples?

Answer 1

domain is all the x values that are valid for the function
range is all the y values that are valid for the function

Answer 2

Domain = all valid input for a function.
Range = all output of a function.

When looking for domain you do NOT want the following:

1) Negative numbers under a square root
2) 0 in the denominator of a fraction
3) natural log of a number less than or equal to zero

So if you see any situations where (1), (2), or (3) occurs, then those values of x are NOT in the domain.