Simplify a^15/ a^5 Pleaaaaseeeeee
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For the limit approaching 3 from the right, you want to follow the line to the right of x = 3. From the graph you're describing it sounds like that's y = -3. 
The RHS limit is -3 even though f(3) = 7
The RHS limit is -3 even though f(3) = 7