Question: Question: Give an example of a function that is defined on the set of rational numbers that is not an onto function. Identify one value

Question: Give an example of a function that is defined on the set of rational numbers that is not an onto function. Identify one value that is not mapped to, to demonstrate that it is not onto.

My answer:

f : Q---> Q (Set of Rational Numbers), wheref(x) = x²+ 1 is not an onto function.

Here -2 belongs to Q has no preimage. So not onto.

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