Step 1:

A function is said to be one to one if any two elements in the domain are correspond to two different elements in the range.

If and are two different inputs of a function ,then is said to be one to one provided  .

For the function every element in domain is mapped with different elements in the range, no two elements in the domain is not mapped with same element in the range.

So the function is said to be one to one.

Solution:

The function is said to one to one.