Final answer:
The domain of the relation is {-1, 8, -2} and the range is {8, -4, -7, 0}.
Step-by-step explanation:
The domain of a relation is the set of all possible input values, or the x-values. The range of a relation is the set of all possible output values, or the y-values.
In the given relation H={(-1,8),(8,-4),(-2,-7),(-2,0)}, the domain is {-1, 8, -2} because these are the unique x-values in the relation. The range is {8, -4, -7, 0} because these are the unique y-values in the relation.