Using the domain values {-1, 0, 4}, find the range values for relation f (x) = 3x-8.

So, this is a line, right? Then, the range, which is basically the min and max values of the values of f (x) ('vertical axis') can be found by substituting the extremes of the domain ('x axis'). There will be no ups and downs since it's a line:

Range = {3 * (-1) - 8, 3*4-8} = {-11,4}