Whether the function is one-to-one.
The function is one-to one.
Use horizontal line test to determine whether the function is one-to-one.
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.
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 exactly at once which means it passes the horizontal line test. Therefore, the function is one-to-one.
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