Whether the function is one-to-one.
The function is not a one-to one function.
Horizontal line test states that the graph of the function is one-to-one function if and only if a horizontal line intersects the graph exactly once.
Use the horizontal line test to determine whether the function is one-to-one.
Sketch the graph of the function and perform the horizontal line test as shown below in Figure 1.
From Figure 1, it is observed that the horizontal line intersects the curve at many points, which means it fails the horizontal line test.
Therefore, the function is not a one-to-one function.
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