is this mapping a function or not a function? not a function function

is this mapping a function or not a function? not a function function

is this mapping a function or not a function? not a function function

Answer

Explanation:

Step1: Recall function definition

A function is a relation where each input has exactly one output.

Step2: Check the mapping

In the given mapping, the input -1 has two outputs 0 and 4.

Answer:

Not a Function