The viewer needs to pay attention to "a", which determines whether the graph will be above the asymptote (positive "a") or below the asymptote (negative "a"). We also need to pay attention to solving for the x-intercept. If we get a negative number on one side, we cannot take the natural log of it, making it undefined. This is lead to NO x-intercept for this graph. Another concept to recognize for these problems are the range, which depend on the "a", whether it is above or below the asymptote, and the asymptote itself.
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