False, f(x) is not a function.
What is function?
Function is that relation in which each element of set A mapped with only one element of another set that is set B.
It is necessary to be one to one mapping
In the given figure,
let set A = {0,5,10,15},
and set B = {0,1,2,3}
The element of set A mapped with only one element of set B except 5 which mapped with two elements in set B.
Element 5 mapped with {1,3} that is not fulfilling the definition of function.
Hence, f(x) is not a function.
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