Answer
Not a one-to-one function
Work Step by Step
To know if the given function represents a one-to-one function, perform the Horizontal Line Test.
If each horizontal line will pass through exactly one point only on the graph, then the function is one-to-one.
Note that some horizontal lines (horizontal lines below the x-axis) will pass through two points on the graph.
This means that the given function is NOT a one-to-one function.