The domain is .
To find the range we can use the following statement abou function:
If and are two subsets of A, then
In this case let
We have .
Then the range is
Then sketch y = x^2, and erase everything before x = 2 and after x = 4. Make sure to draw filled-in circles for each of the endpoints.
To find the range, look at your graph. Which y-values are covered by this graph? (If you "collapsed the graph sideways onto the y-axis, which portions would be covered?)