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The viewer needs to pay special attention to how and why the graph does NOT have an x-intercept. Since taking the natural log of a negative number would be undefined, the graph therefore never crosses the x axis. Logically speaking, the viewer knows that the graph will be above the horizontal asymptote because "a" is positive. And since the graph will never cross over y=2, they can see that there will not be an x-intercept.
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