Let {2,3,4} and {8,9,10}. Define a relation H from A to B such that (x,y)∈H if and only if y−x2

Let {2,3,4} and {8,9,10}. Define a relation H from A to B such that (x,y)∈H if and only if y−x2 is an integer.

Find the number of elements of H.


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